Well, this is hardly even in the case described above under Windows 10. Quarto works much more flexibly with a variety of encodings. In any case, it now allows you to fill even the names of chunks in Cyrillic, which cannot be done in Rmarkdown.
I checked under Windows 11 on another machine and everything is fine there:
`D:\Users\arodionov\Documents\Projects\22.08_EDU_scorecard>quarto check all
[>] Checking Quarto installation......OK
Path: C:\Program Files\RStudio\resources\app\bin\quarto\bin
[>] Checking basic markdown render....OK
[>] Checking Python 3 installation....(None)
Unable to locate an installed version of Python 3.
Install Python 3 from https://www.python.org/downloads/
[>] Checking R installation...........OK
[>] Checking Knitr engine render......OK