I was able to reproduce the bug you're seeing when using the global Arch electron instead of the builtin one (WIP branch: https://gitlab.com/dpeukert/mongodb-compass-pkgbuild/tree/electron).
There are several issues regarding this bug filed on their Jira, but from what I can tell it doesn't look like any progress is being made as of yet (oh the wonders of proprietary software):
https://jira.mongodb.org/browse/COMPASS-3484
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