Closing the issue I reported since it's such a niche case 

OK, that makes sense. The only reason I noticed is because I've been adding releases from a Georgian artist and had to research how capitalization worked in Georgian. I think that almost everyone added Georgian script release would know the correct capitalization, and Georgian script released are uncommon enough that there's probably no point in adding a special mode for it. (I assume that the Turkish mode is for the dotted and undotted "I"s?) I keep an eye on the languages and scripts page, so I'll fix any mistakes eventually.

Playing around with the guess case function, it seems that it affects any character with Unicode case folding (Tested using Safari and Chromium on the latest MacOS.)

The main issue here is that we have no guess case for Georgian, so nobody should probably be using guess case in Georgian to begin with. Obviously someone using the existing guess case modes "English", "French" or "Turkish" and expecting it to work for Georgian would be making a mistake "Sentence" would be closer, but still require a bit of manual amendment. We could, of course, consider having a Georgian guess case mode (and it might very well make sense, if it's as simple as "all lowercase"), but honestly, the easiest at least for now might be to just have a Georgian guideline (we don't seem to have any at the moment) and the guideline could additionally remind users that guess case will not give 100% correct results for Georgian, but that sentence mode will give the closest results and require manually lowercasing the first letter of each title.