Not sure it was an issue with the decay timer as the buildings they were in remained fully intact (beside missing portal). Anyway was offering an alternative possibility if decay timers were not the cause of the issue was all. As far as decay timers go though you do have to wait up to around 30 seconds when entering the render range for them to reset (counting in my head after pulling out repair hammer to check timer so not properly timed but very consistent), porting in and porting back out can end up with reset not happening as a result (maybe the timer bug your referring to idk).
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