In Ubuntu 24.5 LibreOffice use wrong directory to search dictonary of e.g. nl_NL.dict and nl_NL.aff. It uses
/snap/usr/share/myspell/dicts/ , which is part of the snap, but it should use
/usr/share/hunspell
The deb version of LibreOffice works fine, so I thing this is changed in the snap version.
Peerhaps you can correct it, or provide me with the changes in the snap-version, so I can debug it myself and provide a solution.