I've greatly simplified my original report and have uploaded new screenshots that should clearly demonstrate the problem, and hopefully show that it does not appear to be strictly limited to stairs.
Zuriki seems to be correct. I've just tested this with half slabs and snow blocks, and the same problem occurs there as well.
Apologies for the dupe! Glad to see this is resolved 🙂 Cheers.
Kieran Foster
I've greatly simplified my original report and have uploaded new screenshots that should clearly demonstrate the problem, and hopefully show that it does not appear to be strictly limited to stairs.