If a field protected by another permission than EDIT is marked Required after an issue has been created with that field blank, when a user that does not have that other permission goes to edit an issue he will not be able to. The reason is that the field is not shown to him as he does not have the other permission, but the validation fails as the field is marked required - since the field is not on the page the error is never rendered on the page.

Can think of 2 cases for this issue:

• Fix Versions due to RESOLVE Permission
• Due Date due to the SCHEDULE permission

This also happens during issue creation if Fix Versions is required and the user does not have RESOLVE permission.

Also see linked issue for the security level field.