When putting redstone on half-slabs instead of full blocks going upwards, the trail going upwards does not show although the redstone works. The trail probably is coded so it won't show as usual to avoid a floating part of a redstone trail, but it would be a nice visual effect and would work better than the current alternative.
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Slabs were added later, in Minecraft Beta.
Avoma
Duplicate of MC-181636.
Sorry, I did a Google search for this bug but I guess I should have searched within Jira! Is there a way to mark this post as a duplicate or to delete it?
This has been an issue since either redstone or slabs were added (whichever was added last) however, the signal shall still transmit between the blocks.