To reproduce, place a top slab, put a piece of redstone dust on top and then place a piece of redstone dust below one of its four horizontal neighboring blocks. See attached screenshot.
Linked issues
is duplicated by
MC-124698
Redstone wire on hopper and redstone block does not update shape and surrounding blocks when redstone wire is placed / removed diagonally downwards
MC-125938
redstone wire do not connect correctly on slab
MC-126493
redstone dust on stairs and slabs don't update when going up and down slopes
MC-131516
Redstone placed on Slabs and Stairs do not connect properly
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michael