Is Geany uses the latest (current) version of Universal Ctags?
Unfortunately no, not yet. But "conservative" parsers (e.g. not using too recent features from UCTags) work the same.
P.S. I think maybe try to add special tag `#Region - #EndRegion`?
if it's useful info, I guess, sure. U-CTags has support for custom fields like where a symbol end, so this should be used instead of emitting 2 tags (but Geany doesn't support it yet).