The bug
From (202, 38) to (202, 43) in the shulker box GUI texture there is a random dark gray line of varying alpha values. This isn't visible in-game, but it probably shouldn't be there.
MC-119051
Random transparent line in shulker box GUI texture
Resolved
Fixed
4
(Unassigned)
Confirmed
Textures and models
gui, shulker_box, texture
Minecraft 1.12, Minecraft 1.12.2, Minecraft 18w07c, Minecraft 1.13.1, Minecraft 1.13.2, ..., 1.14.4, 1.15 Pre-release 1, 20w09a, 20w19a, 20w51a
21w03a
Retrieved
Confirmed for 20w09a.