Dimension is officially not maintained anymore

[ToeiRei]

The repo states:

Please be aware that Dimension is no longer formally maintained. 
Bugs are not being looked at, and features are not being implemented. 
Support for the project is extremely limited as well - please check the issue tracker
before attempting to use Dimension.

Due to some outstanding bugs I would suggest dropping it and adding https://github.com/maunium/stickerpicker for managing stickers...

[turt2live]

fyi, the project has now formally been archived: it's got more than a year's worth of undiagnosed security issues and doesn't even run in many cases. There are no replacements at this time beyond Element's own built-in one.