Specially rendered blocks lighting transition is not smooth.
Block types:
Head
Shulker box
Bed
Chest
Trapped chest
Signs
Hanging signs
Decorated pot
Banner
...
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Can confirm.
Can confirm in 1.18.1.
Can confirm in 1.18.2.

Do doors count as "specially rendered"? Last I checked, all of their geometry was defined in the model file... did MC-67308's fix convert doors over to block entities?

I just assumed they were specially rendered as they are double blocks so I added them to the description, but I might very well be mistaken. I'll remove them again for now.

Yeah, no, they don't use entity rendering (and have no block entity), so they do not belong here.

Stonecutters, lightning rods, turtle eggs, cauldrons, and lecterns aren't specially (entity) rendered blocks; they should NOT be listed here if they have smooth lighting issues.