I forgot.
Or to be more precise: I wanted to post a screenshot quite fast but first wanted to reproduce the incident. But at that time synching via iCloud worked at maximum once per day. Thank you, Catalina! (No, I did not set DEVONthink to sync once per day.) And only after that I forgot.
Meanwhile I don’t think a ticket would be appropiate because it is a macOS wide phenomenon.
But screenshots you will get:
That’s how it started with a md file synced from DTTG. Admittedly I stared quite baffled at the inspector pane.
These md files were created with iAWriter on the Mac.
When I played around with a smart rule and wanted to replace temporarily the Kind condition by the Extension condition I found the Chinese characters even there:
While the first screen shots was taken on a Catalina beta the latter represent the present day official release version.