Still works for me. Upper or lower slabs over a chest does not block it from opening. Shulker boxes are different, because they grow in size as they open, so lower slabs will block shulker boxes from opening.
There is a glitch in early versions of Forge that interferes with MoreCommands. Perhaps here too. Try the recommended or later version of Forge.
It is a "bug" in Forge itself:
LexManos commented on May 4, 2016 • edited
The bottom side of NORMAL stairs is solid so it does block the chest. And yes this is a difference between vanilla and forge. And yes we COULD special case vanilla block's and reintroduce this 'feature'. But instead we fix the bug correctly and call it good.
It's much preferred that the game stay as is and hope that mojang will EVENTUALLY fix the bug on their end. This has been the case since ~1.2.5 and only a handful of people care. The rest like the mechanic so we're keeping it.
This is the ONE exception where we change vanilla mechanics and refuse to go back because as I said, it's considered a bug in Vanilla on our end.
Apparently, they see this as the intended behavior and vanilla as bugged, and it does make more sense than vanilla - any block, no matter what it is, with a solid side directly above a chest prevents you from opening it (in a similar manner Mojang themselves recently allowed torches to attach to the sides of non-full cube blocks with a solid face; the face determines the property, not the block itself).
Your question made me curious..as I have about the same gaming setup. I did some testing, and from your screenshot; this SHOULD BE WORKING... I even tested it out with the 2x tall room in your screenshot.. slabs on chests do not stop from opening. The only thing I couldnt test, was that material you used for the slab (i don't have any jungle wood... and I NEVER play creative :))
BTW... love your compass/map widget icon in the corner.. how did you get that >?
CHEST WITH SLABS TEST
Rollback Post to RevisionRollBack
Vanilla Survival MC. non-modded, only Optifine and Bdcraft graphics -
Well, I did mention that I am using the latest version of Forge with 1.12.2. So that doesn't apply, also the gentleman above your post, The_Dread_Minecrafter, did mention that he is using the same configuration as myself and he is not having that problem, therefore it cannot be Forge. I did do my homework before posting. I had Googled the problem and read the above quotes.