Get overlapping components/actors is not fully populated with initial overlaps by BeginPlay in 4.24, like they were in 4.23
In 4.23 each BP detected the other via get overlapping components.
In 4.24 neither BP detects the other.
Note that by setting bGenerateOverlapEventsDuringLevelStreaming for the BPs, the BPs loaded later will detect the ones that were loaded earlier, however their begin/end overlap events are not called, and there is still no good way of detecting these initial overlaps.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-86045 in the post.