The bug
Despite being a full block space, when trying to place vines on the underside of a slab/stairs, the placement will completely refuse to take place. However, if a block is placed diagonally to the stair and a vine is placed on that, then it becomes possible to place the vine on the bottom of the stair. Also, removing the supporting block will also destroy both placed vines, where it should really only be removing the one attached to the destroyed block and leaving the one below the stair intact. Updating the vines will delete the underside vine, without playing a breaking sound.
Glow lichen is not affected.
Related issues
is duplicated by
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muzikbike
Affects 18w19a. It seems as though updating the vine under the stairs makes it disappear, should this be reported as a separate bug?
CreeperMagnet_
Affects 1.13-pre4.
Misode
Random ticks also cause the vine under the stairs to update.
Sonicwave
Removed @unknown as the reporter as he requested so on Discord. If someone else wants to have ownership of this report and keep it updated, please comment here or request on Discord.
violine1101
Ticket has been given to @unknown as per their request on Discord https://discordapp.com/channels/647810384031645728/648555618994618378/707543020404473866
migrated
How this is WAI?