Yes, the wysiwyg editor is terribly inconsistent between their products. Another thing that is super inconsistent is whether your work is saved as draft or not.

My co-worker once lost 2 hours of work spent on drafting a new JIRA issue (or maybe it was a comment, I don't remember).

There's a feature request in their tracking system for preserving un-saved work. It's been there for almost 20 years now: https://jira.atlassian.com/browse/JRASERVER-4233