I was building a stylized tunnel in the nether when I discovered an odd glitch that prevented me from walking up the stair blocks was using. It seems like when the staircase is 1 wide and both sides of it are filled in with blocks (as in Block, Stair, Block) you can't walk up it from soul sand. It doesn't seem to affect wider gaps where the staircase is 2 or more blocks wide, just very thin tunnel staircases. After a few minutes of attempting to ascend I was able to go up when approaching at an angel but couldn't do so again after some more testing.
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Cannot Confirm/Reproduce in 20w27a.
I don't know if this is exactly what John Rodri ment, but this seems to work fine for me. I can perfectly walk up the staircase. Also works when using stairs blocks above the soulsand.
I attached some screenshots, I can't ascend the staircase. Before you ask i also removed the staircase block above it to try and it still doesn't work. I can go up the steps on the three-wide one next to it but not the one wide one between the two basalt pillars. The second screenshot is me walking into it and not going up the step.
A bit more testing, I thought it was soul speed that was doing it. But after switching the soul sand and soul soil for the stairs it seems like soulsand stops you from walking up a stairblock. Not sure if this has always been a thing since I've never used soul sand for a floor block before, for obvious reasons.
Hello again!
This looks like a duplicate of MC-42726. This is an intentional feature, and you shouldn't expect it to be patched as a bug. You can suggest a change to this on the feedback website at https://feedback.minecraft.net/hc/en-us.
Could you please provide some screenshots of your setup so we can understand and replicate your issue?