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5.8-SNAPSHOT oxt extension is failing to check

I’ve just built oxt from the latest git, and it installed fine. But when I try to run LT on my Ukrainian document in LibreOffice Writer with “Check Text” or any other option I am getting this error:
It seems the automatic grammar check is disabled. Please enable “Check grammar as you type” at “Tools”/“Options”/“Language Settings”/“Writing Aids”
But when go to Writing Ads, this open is enabled. I’ve tried to uncheck/check it and it didn’t help.
It’s LibreOffice 7.2.7.2, Linux (Fedora 35), OpenJDK 11.0.15