RTF document not read from Cryptomator drive

I’ve installed Cryptomator and it comes with two rtf files. These show an empty page when opening in OnlyOffice. Is this a problem with Cryptomator or something else?
WELCOME.rtf (471 Bytes)
WELKOM.rtf (536 Bytes)

Hello @theking2

We need some time to check these files, please await my feedback.

We have registered a bug on this behavior for further investigation. I am keeping you posted.