Question Building WebGL with System Text Json Error

Hi,
so I've been looking through the forum and found couple of Threads about System.Text.Json, however, apparently since .net standard 2.1 it should be fine? But I get an error during the build as follows down below in the spoiler. I need the dll for another library (socket.io). Any advice or help would be very much appreciated. It works perfectly fine in the editor, but as soon as I try to build it this error appears.
Thank you very much in advance!

Using:
Unity 2021.2.7f1
system.text.json.6.0.1 (build for netstandard2.0)

Spoiler

Building Library\Bee\artifacts\WebGL\GameAssembly.\master_WebGL_wasm\zqe2_Text.Json1.o failed with output:
D:\Projects\Unity\SocketIOTest\Library\Bee\artifacts\WebGL\il2cppOutput\cpp\System.Text.Json1.cpp:12360:11: error: no viable overloaded '='
V_3 = L_12;
~~~ ^ ~~~~
D:\Projects\Unity\SocketIOTest\Library\Bee\artifacts\WebGL\il2cppOutput\cpp\System.Text.Json1.cpp:2612:8: note: candidate function (the implicit copy assignment operator) not viable: no known conversion from 'ValueTask_t10B4B5DDF5C582607D0E634FA912F8CB94FCD49F' to 'const ValueTask_tD1A250CC105307FE5FB0D9D930345BB719E6B711' for 1st argument
struct ValueTask_tD1A250CC105307FE5FB0D9D930345BB719E6B711
^
D:\Projects\Unity\SocketIOTest\Library\Bee\artifacts\WebGL\il2cppOutput\cpp\System.Text.Json1.cpp:2612:8: note: candidate function (the implicit move assignment operator) not viable: no known conversion from 'ValueTask_t10B4B5DDF5C582607D0E634FA912F8CB94FCD49F' to 'ValueTask_tD1A250CC105307FE5FB0D9D930345BB719E6B711' for 1st argument
struct ValueTask_tD1A250CC105307FE5FB0D9D930345BB719E6B711
^
D:\Projects\Unity\SocketIOTest\Library\Bee\artifacts\WebGL\il2cppOutput\cpp\System.Text.Json1.cpp:12884:9: error: no viable overloaded '='
V_4 = L_8;
~~~ ^ ~~~
D:\Projects\Unity\SocketIOTest\Library\Bee\artifacts\WebGL\il2cppOutput\cpp\System.Text.Json1.cpp:2612:8: note: candidate function (the implicit copy assignment operator) not viable: no known conversion from 'ValueTask_t10B4B5DDF5C582607D0E634FA912F8CB94FCD49F' to 'const ValueTask_tD1A250CC105307FE5FB0D9D930345BB719E6B711' for 1st argument
struct ValueTask_tD1A250CC105307FE5FB0D9D930345BB719E6B711
^
D:\Projects\Unity\SocketIOTest\Library\Bee\artifacts\WebGL\il2cppOutput\cpp\System.Text.Json1.cpp:2612:8: note: candidate function (the implicit move assignment operator) not viable: no known conversion from 'ValueTask_t10B4B5DDF5C582607D0E634FA912F8CB94FCD49F' to 'ValueTask_tD1A250CC105307FE5FB0D9D930345BB719E6B711' for 1st argument
struct ValueTask_tD1A250CC105307FE5FB0D9D930345BB719E6B711
^
2 errors generated.
emcc2: error: '"C:/Program Files/Unity/Hub/Editor/2021.2.7f1/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/llvm\clang++.exe" -target wasm32-unknown-emscripten -DEMSCRIPTEN -fno-inline-functions -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-cxx-exceptions -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr -D__EMSCRIPTEN_major__=2 -D__EMSCRIPTEN_minor__=0 -D__EMSCRIPTEN_tiny__=19 -D_LIBCPP_ABI_VERSION=2 -Dunix -D__unix -D__unix__ -Werror=implicit-function-declaration -Xclang -iwithsysroot/include/SDL "--sysroot=C:\Program Files\Unity\Hub\Editor\2021.2.7f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten\cache\sysroot" -Xclang -iwithsysroot/include\compat -D__webgl__ -Wno-c++11-extensions -Wno-nonportable-include-path -ffunction-sections -fno-unwind-tables -fomit-frame-pointer -fno-threadsafe-statics -std=c++11 -Wno-#warnings -Wswitch -Wno-trigraphs -Wno-tautological-compare -Wno-invalid-offsetof -Wno-implicitly-unsigned-literal -Wno-integer-overflow -Wno-shift-negative-value -Wno-unknown-attributes -Wno-implicit-function-declaration -Wno-null-conversion -Wno-missing-declarations -Wno-unused-value -Wno-pragma-once-outside-header -fvisibility=hidden -fexceptions -fno-rtti -fno-strict-overflow -ffunction-sections -fdata-sections -fmessage-length=0 -pipe -DBASELIB_INLINE_NAMESPACE=il2cpp_baselib -DIL2CPP_MONO_DEBUGGER_DISABLED -DRUNTIME_IL2CPP -DHAVE_BDWGC_GC -DNDEBUG -I. -ID:/Projects/Unity/SocketIOTest/Library/Bee/artifacts/WebGL/il2cppOutput/cpp "-IC:/Program Files/Unity/Hub/Editor/2021.2.7f1/Editor/Data/il2cpp/libil2cpp/pch" "-IC:/Program Files/Unity/Hub/Editor/2021.2.7f1/Editor/Data/il2cpp/libil2cpp" "-IC:/Program Files/Unity/Hub/Editor/2021.2.7f1/Editor/Data/il2cpp/external/baselib/Include" "-IC:/Program Files/Unity/Hub/Editor/2021.2.7f1/Editor/Data/il2cpp/external/baselib/Platforms/WebGL/Include" -Oz -fcolor-diagnostics -fdiagnostics-absolute-paths -UGC_THREADS -UUSE_MMAP -UUSE_MUNMAP -c -xc++ D:/Projects/Unity/SocketIOTest/Library/Bee/artifacts/WebGL/il2cppOutput/cpp/System.Text.Json1.cpp -o Library/Bee/artifacts/WebGL/GameAssembly./master_WebGL_wasm/zqe2_Text.Json1.o' failed (1)
UnityEngine.GUIUtility: ProcessEvent (int,intptr,bool&)