I started having issue where raid base instantly despawn after raid is completed, even the bubble and timer is gone.

I removed both "LockedBoxesImmortal" and "LockedDoorsImmortal" flags from the TruePVE plugin but issue still persist(refer to TruePVE v2.1.6 update changelog). I'm not sure what is causing it now. I noticed it started happening after I migrated to Carbon but not 100% sure if thats the reason.

Any help would be appreciated.

yea Carbon uses invokes for their timers which is not working for some reason.
either way, this is changed in the next update to not use any timers for that so you won't have this issue.

i see, finally found the reason after spending few days of trying to fix it 😵 by "next update", do you mean the next update of raidable bases or carbon?

next update of raidable bases