Were you able to revert the customized “js.chat.retention_reminders.dm” string? I’d like to close this bug if that solved it for you.
Well, issue #2 is my bad. I’ll fix that. FIX: Wrong interpolation key by gschlager · Pull Request #20374 · discourse/discourse · GitHub
Issue #1 is a different problem. Would you mind creating a new bug report for that?