yeah i suppose it is roughly the same, i didn't notice that when i checked for any similar reports, but i think this issue being repeatedly reported as many times as it has been should be a sign that this is important enough, to enough different players, that it should at least be Reconsidered, even if it won't be fixed with utmost haste and priority (which i don't believe it should, i don't think this is something that even Can be fixed fast or without a rewrite of how textures are handled).
i'm personally not planning on doing any in-world custom models because i don't know if i can actually make the textures line up properly without compensating for the issue by making every piece out of individual 2x2 cubes, others might be in the same or roughly similar situations, not thinking it's worth it to work on things that will go in the world because they likely won't line up with textures as well as they should.
i've now also added another optional step to method 1 to make seeing the inconsistencies easier via scaling the display entity up.
i've added highlighted versions of the three screenshots and a note recommending the use of a spyglass when attempting to reproduce this (also fixed some broken formatting)
i have updated the steps to recreate to include the commands necessary to do so, i can also provide specific tp coordinates to better illustrate where the problems are if need be but they should be obvious just by looking closely
i have found this bug affects all entities, not just display entities, looking closely at paintings reveals inconsistent pixel aspect ratios causing misaligned grids
Can confirm in 1.21 and preceding updates.
Provided a datapack as requested, sorry for the delay.
I've rewritten the report as best as i could, removing excess context, commands, and optional steps. Hopefully this is succinct enough despite the 2 methods, i felt i needed to keep the second method because it's the one i used in the reproduction i added screenshots of, and the custom models in the resource pack would go to waste.
edit: i've reworded certain parts as i've discovered the issue oddly does not occur when 16x16 cubes- either blocks or custom models- are aligned perfectly with the block grid. my original steps could have lead to the issue not appearing due to misguided alignment choices in the commands.