Compile errors that prevent prefabs to be updated correctly

Is it solvable?

MissingFieldException: Field 'UnityEditor.Scripting.Compilers.ScriptCompilerBase._island' not found.
UnityEditor.Scripting.Compilers.ScriptCompilerBase.BeginCompiling () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/Compilers/ScriptCompilerBase.cs:69)
UnityEditor.Scripting.ScriptCompilation.CompilationTask.QueuePendingAssemblies () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/CompilationTask.cs:236)
UnityEditor.Scripting.ScriptCompilation.CompilationTask.Poll () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/CompilationTask.cs:143)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileScriptAssemblies (UnityEditor.Scripting.ScriptCompilation.ScriptAssembly[] scriptAssemblies, UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings scriptAssemblySettings, System.String tempBuildDirectory, UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.Scripting.ScriptCompilation.CompilationTaskOptions compilationTaskOptions, UnityEditor.Scripting.ScriptCompilation.EditorCompilation+CompileScriptAssembliesOptions compileScriptAssembliesOptions) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:1086)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileCustomScriptAssemblies (UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings scriptAssemblySettings, System.String tempBuildDirectory, UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.BuildTargetGroup platformGroup, UnityEditor.BuildTarget platform) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:998)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileCustomScriptAssemblies (UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.BuildTargetGroup platformGroup, UnityEditor.BuildTarget platform) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:992)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface+<CompileCustomScriptAssemblies>c__AnonStorey3.<>m__0 () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:277)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface.EmitExceptionAsError[T] (System.Func`1[TResult] func, T returnValue) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:97)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface:CompileCustomScriptAssemblies(EditorScriptCompilationOptions, BuildTargetGroup, BuildTarget)

MissingFieldException: Field 'UnityEditor.Scripting.Compilers.ScriptCompilerBase._island' not found.
UnityEditor.Scripting.Compilers.ScriptCompilerBase.BeginCompiling () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/Compilers/ScriptCompilerBase.cs:69)
UnityEditor.Scripting.ScriptCompilation.CompilationTask.QueuePendingAssemblies () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/CompilationTask.cs:236)
UnityEditor.Scripting.ScriptCompilation.CompilationTask.Poll () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/CompilationTask.cs:143)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileScriptAssemblies (UnityEditor.Scripting.ScriptCompilation.ScriptAssembly[] scriptAssemblies, UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings scriptAssemblySettings, System.String tempBuildDirectory, UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.Scripting.ScriptCompilation.CompilationTaskOptions compilationTaskOptions, UnityEditor.Scripting.ScriptCompilation.EditorCompilation+CompileScriptAssembliesOptions compileScriptAssembliesOptions) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:1086)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileScripts (UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings scriptAssemblySettings, System.String tempBuildDirectory, UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.Scripting.ScriptCompilation.EditorBuildRules+TargetAssembly[]& notCompiledTargetAssemblies, System.String[]& notCompiledScripts) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:984)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileScripts (UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.BuildTargetGroup platformGroup, UnityEditor.BuildTarget platform) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:874)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface+<CompileScripts>c__AnonStorey2.<>m__0 () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:270)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface.EmitExceptionAsError[T] (System.Func`1[TResult] func, T returnValue) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:97)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface:CompileScripts(EditorScriptCompilationOptions, BuildTargetGroup, BuildTarget)

Exception generating network code: System.Exception: Assembly Temp/UniRx.Async.dll does not exist!
at Unity.UNetWeaver.Program.CheckAssemblyPath (System.String assemblyPath) [0x0001c] in /Users/builduser/buildslave/unity/build/Extensions/Networking/Weaver/Program.cs:52
at Unity.UNetWeaver.Program.CheckAssemblies (System.Collections.Generic.IEnumerable`1[T] assemblyPaths) [0x00016] in /Users/builduser/buildslave/unity/build/Extensions/Networking/Weaver/Program.cs:46
at Unity.UNetWeaver.Program.Process (System.String unityEngine, System.String unetDLL, System.String outputDirectory, System.String[] assemblies, System.String[] extraAssemblyPaths, Mono.Cecil.IAssemblyResolver assemblyResolver, System.Action`1[T] printWarning, System.Action`1[T] printError) [0x00014] in /Users/builduser/buildslave/unity/build/Extensions/Networking/Weaver/Program.cs:31
at UnityEditor.Scripting.Serialization.Weaver.WeaveInto (UnityEditor.Scripting.ScriptCompilation.ScriptAssembly assembly, System.String assemblyPath, System.String outputDirectory, System.String unityEngine, System.String unityUNet, System.String[] extraAssemblyPaths, Mono.Cecil.IAssemblyResolver assemblyResolver) [0x000b4] in /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/Serialization/Weaver.cs:67 at Unity.UNetWeaver.Program.CheckAssemblyPath (System.String assemblyPath) [0x0001c] in /Users/builduser/buildslave/unity/build/Extensions/Networking/Weaver/Program.cs:52
at Unity.UNetWeaver.Program.CheckAssemblies (System.Collections.Generic.IEnumerable`1[T] assemblyPaths) [0x00016] in /Users/builduser/buildslave/unity/build/Extensions/Networking/Weaver/Program.cs:46
at Unity.UNetWeaver.Program.Process (System.String unityEngine, System.String unetDLL, System.String outputDirectory, System.String[] assemblies, System.String[] extraAssemblyPaths, Mono.Cecil.IAssemblyResolver assemblyResolver, System.Action`1[T] printWarning, System.Action`1[T] printError) [0x00014] in /Users/builduser/buildslave/unity/build/Extensions/Networking/Weaver/Program.cs:31
at UnityEditor.Scripting.Serialization.Weaver.WeaveInto (UnityEditor.Scripting.ScriptCompilation.ScriptAssembly assembly, System.String assemblyPath, System.String outputDirectory, System.String unityEngine, System.String unityUNet, System.String[] extraAssemblyPaths, Mono.Cecil.IAssemblyResolver assemblyResolver) [0x000b4] in /Users/builduser/buildslave/unity/build/Editor/Mono/Scripting/Serialization/Weaver.cs:67
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface:TickCompilationPipeline(EditorScriptCompilationOptions, BuildTargetGroup, BuildTarget)

 

Could you please submit a bug-report, as explained in this document:
https://unity3d.com/unity/beta/guide-to-beta-testing#tab-3

After you submitted the report, you'll receive a confirmation email with a bug-report ID. Please post the bug-report ID in this thread for Unity staff to pick up.

 

I guess I have a similar issue - @Foriero did you submitted a bug ?