I’ve hit on a strange problem.
The titles of topics, if they include non-English characters (e.g. CJK), all-capitalized English words get turned into lower-case, except for the first letter which is upper-case.
This does not happen in English titles.
PPT: This is a POWERPOINT presentation
is not affected, but:
gets turned into
It does not seem to affect words that are mix-casing.