Let’s imagine someone had installed the 13.2 beta of iPadOS on his (or her) iPad and the oh-so-shiny Golden Master of Catalina on his Mac.
When that irresponsible, imagined human being wrote an MD note on DTTG and synced it via iCloud to DT Pro on his (or her) Mac DT’s inspector would show “Kind: md 文件”. You can stay calm, “文件” isn’t anything naughty but means “file” in Chinese.
DT would display and allow editing of the md 文件 just as a md file without the Chinese supplement. But the smart rule that is supposed to automatically convert the MD to RTF would refuse to do so as md 文件 lies out of its jurisdiction. (RTF does sync to RTF just fine, by the way.)
That imagined, irresponsible, gullible—some might even feel an unstoppable urge to come up with way harsher terms—person would without doubt be too ashamed to admit that (s)he was so irresponsible &c. and therefore would not report the bug. Which would be a shame on its own, wouldn’t it?