The current create issue dialog is not populated based on the tab's project context, rather, it is populated based on the last project the user has interacted with. Some users work under different projects and switch context often, and due to the current behavior of the Create Issue Dialog it makes this work style difficult.

It has been mentioned that this behavior will change in the next iteration of the issue creation dialog (please see this comment in JRACLOUD-69274)and this suggestion is to both request this request and track the interest for it.