Following Tibetan dictionary integration in https://bugs.documentfoundation.org/show_bug.cgi?id=103922 please update the Tibetan dictionary files in https://cgit.freedesktop.org/libreoffice/dictionaries/ to match with the latest version on https://github.com/eroux/hunspell-bo You can find an updated oxt on the page of the extension: https://extensions.libreoffice.org/extensions/tibetan-spellchecker/0-4.0/view Thank you!
Updated with the following commit. Thanks for the patience! https://cgit.freedesktop.org/libreoffice/dictionaries/commit/?id=471ccf158958a7e7968c96796bdf4dcfe4142bb3 author Aron Budea <aron.budea@collabora.com> 2017-10-23 06:38:16 (GMT) committer Aron Budea <aron.budea@collabora.com> 2017-10-23 16:37:13 (GMT) tdf#112065: Update Tibetan (bo) dictionary to 0.4