TNT falling through slabs when ignited it.
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Can confirm only for type=bottom
slabs, but it appears as though it's only happening on the side of either the server or the client - the ignited TNT then "glitches" back up and appears to destroy the platform it was ignited on.
Can confirm.

It not only affected slabs here is a list of other blocks affected
Affect blocks
Campfires
Fence gates
Fences
Walls