The errors are of the type:
---------------------
[21902/44128] ACTION //brave/components/brave_wallet_ui/page:brave_wallet_page_ui(//build/toolchain/win:win_clang_x64)
Exception in thread Thread-2:
Traceback (most recent call last):
File "c:\brave-browser\src\brave\vendor\depot_tools\bootstrap-2@3_8_10_chromium_20_bin\python3\bin\lib\threading.py", line 932, in _bootstrap_inner
self.run()
File "c:\brave-browser\src\brave\vendor\depot_tools\bootstrap-2@3_8_10_chromium_20_bin\python3\bin\lib\threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "c:\brave-browser\src\brave\vendor\depot_tools\bootstrap-2@3_8_10_chromium_20_bin\python3\bin\lib\subprocess.py", line 1370, in _readerthread
buffer.append(fh.read())
File "c:\brave-browser\src\brave\vendor\depot_tools\bootstrap-2@3_8_10_chromium_20_bin\python3\bin\lib\encodings\cp1252.py", line 23, in decode
return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x90 in position 180: character maps to <undefined>
---------------------
Started showing up after transitioning to using python3.