The bug
There is a pixel on the top of the loom that is incorrectly colored in one column making it inconsistent with the other columns.
Linked issues
Attachments
Comments 18
Can confirm in 21w16a. @unknown, this ticket has an assigned "Mojang Priority" which means that Mojang have confirmed this to be an issue, meaning that this is not intended.
Maybe it was meant to be this way. The string have pixel inconsistencies