Date & Time: 5/31/2023 9:00am
Frequency: Any time switching gear sets/jobs that share the same gear but have different glams
World name: Diabolos
Character name: Eloise Beloise
Class/Level: Any level 90 job
Party or solo: Both
1. Switch to job that shares gear but different glamours (in my case, healer jobs)
2. Update gear set using the icon
3. Change to other job sharing the same gear (say, from whm to sch)
4. Update gear set using the icon
5. Switch back to original job: gear set not updated (additionally, portrait wont work)

Switching between jobs that share the same gear but have different glams results in the gear set not being able to update. This behavior does not happen on jobs that share a glam (in my case, all of my tanks have the same glam -- and this glam is on a glamour plate). Whether or not the glamour uses a glam plate seems to not matter.