When adding water on top of a copper slab it still starts the source block there but acts as if the slab below is is non existent and goes through it
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I'm unable to reproduce this; is it possible that the slab is a ghost block? Does it disappear after you relog?
Actually, it seems like you might have clicked twice. The first click waterlogged the slab, the second placed another water source on top of the slab.
I can see by the adjacent blocks in the video that you waterlogged a top slab, which does not hold water when waterlogged; only bottom slabs can do so.