Spell check bug under Linux

Under Windows, I have German (Switzerland) spell checking - under Linux (Mint) I only have German [Germany].
However, for all other Linux applications, I do have spell check in de-ch.

I have German (Switzerland) under Languages, but it only appears for spell checking under Windows.

Please fix under Linux. Thanks!

Do not close this post - fix the problem, please!

Did you find any updates?
Due to I didn’t resolve yet