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This bug prevented islands from being awoken if you explicitly set all of its particles to sleep, and then teleported one of the particles elsewhere. This was caused by SleepParticle being called before BeginDetectCollisions. This put the particle to sleep but left the collision constraints as they were. When we prune out of date collisions they were destroyed because they were "awake" but were not updated this tick. The fix is to update the sleep state of constraints whose islands will be put to sleep as a result of all particles being put to sleep. #rb vincent.robert [CL 30895513 by chris caulfield in ue5-main branch]