I'm using the latest v2.1.6 but player still reporting that raidable bases instantly despawn after raid finished(even the bubble, timer and map marker was gone).

I'm aware that a fix was released in v2.1.6 to address this issue, but just wanted to report that it is still happening. I can't find out why, no console error at all. I'm suspecting its probably because of "LockedDoorsImmortal" rule. It shouldn't be "LockedBoxesImmortal" since player need to destroy all box to finish the raid. Though I might be completely wrong but hopefully this can help you in your debugging. Thank you!

Meanwhile, I'm gonna remove LockedDoorsImmortal from my ruleset and monitor if that'll stop the issue.

Update: Removing "LockedDoorsImmortal" didn't fix the issue, raid base still instantly despawn. I'm gonna remove "LockedBoxesImmortal" as well and see how it goes.