It quite often happens that layers gets thrown out from their parent layers at other frames than 0.
It most often happens together with the layer update bug (layer panel not updated until you click and thus selecting a completely different layer than you intend).
I know AS are supposed to not be able to move layers out from their parent layers at other frames than 0, but I often find AS having done just that.
Layers moved out of their parents at other frames than 0.
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