The Ukrainian dictionary in this project https://github.com/LibreOffice/dictionaries/ is pretty old. The latest versions could be found in either of these locations: https://extensions.libreoffice.org/en/extensions/show/ukrainian-spelling-dictionary-and-thesaurus or https://github.com/brown-uk/dict_uk/releases
Let's set it to NEW
Aron Budea committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/dictionaries/commit/97a0bfd2eda30586e70a090a8ffc1c83f49e1295 tdf#149980 updated Ukrainian dictionaries to 5.8.0
Aron Budea committed a patch related to this issue. It has been pushed to "libreoffice-7-4": https://git.libreoffice.org/dictionaries/commit/7b1ade6e7803cc6c96a08889ed97a0695f82b09c tdf#149980 updated Ukrainian dictionaries to 5.8.0
Meanwhile, version 5.9.0 was released. I wouldn't open a new bug for this.
Actually 6.0.0 will come out in two weeks. :)
Nice. So, in the future, this should be automatically updated without opening new bugs for each new version.