Hello,
Testing further the Cryptpad spreadsheets, I noticed an issue in rendering Asian characters (Korean, Chinese) - see screenshot attached (on cryptpad.fr). The display is correct on the formula bar, but not in the cell itself.
I can get the proper rendering with the "WenQuanYi Zen Hei Mono" font but then the latin characters don't look like anything.
It works well on onlyoffice.com (tested with arial and calibri)
Best
François