Resolved Collections package throws: The type name 'ReadOnly' does not exist in the type 'NativeArray<T>'

Hello

I've planned to go through Pong tutorial. Loaded packages, added some objects to scene -basically it's an empty project right now. When opening editor it welcomes me with compilation errors:

Library\PackageCache\com.unity.collections@0.8.0-preview.5\Unity.Collections\NativeArrayExtensions.cs(46,63): error CS0426: The type name 'ReadOnly' does not exist in the type 'NativeArray<T>'

Library\PackageCache\com.unity.collections@0.8.0-preview.5\Unity.Collections\NativeArrayExtensions.cs(59,61): error CS0426: The type name 'ReadOnly' does not exist in the type 'NativeArray<T>'

Library\PackageCache\com.unity.collections@0.8.0-preview.5\Unity.Collections\NativeList.cs(612,31): error CS0426: The type name 'ReadOnly' does not exist in the type 'NativeArray<T>'

I'm using Unity 2020.1.0a13.1443 right now.

Packages loaded:


Though project view shows there's much more:


And view from console:

 

Also when trying to recreate the setup I have this:

Library\PackageCache\com.unity.burst@1.3.0-preview.9\Runtime\BurstRuntime.cs(125,34): error CS0117: 'BurstCompilerService' does not contain a definition for 'Log'

Library\PackageCache\com.unity.burst@1.3.0-preview.9\Runtime\BurstRuntime.cs(125,71): error CS0426: The type name 'BurstLogType' does not exist in the type 'BurstCompilerService'

 

nvm, switching to Unity 2020.1.0b4 fixed issue