The topmost row of pixels in Sprites that are in the first line of a Dialog’s Body don’t show

Steps to Reproduce:
Set your GUI Scale to either 2 or 4. (1 and 3 don’t resize sprites correctly anyway)
Run the following command in a command block, and look closely at the top-most row of pixels of the first iron block sprite.

dialog show @p {type:"minecraft:multi_action",title:{sprite:"block/emerald_block"},body:[{type:"minecraft:plain_message",contents:{sprite:"block/iron_block",extra:[" ."]}},{type:"minecraft:plain_message",contents:{sprite:"block/iron_block",extra:[" ."]}},{type:"minecraft:plain_message",contents:{sprite:"block/iron_block",extra:[" ."]}}],actions:[{label:{sprite:"block/gold_block",extra:[" ."]}}]}

 Expected Result:
The topmost row of pixels in the first iron block should show, just like the rest of the sprites.

 Actual Result:
The topmost row of pixels in the first iron block doesn’t show, but it does in the other iron block sprites in lines below it, and the other sprites in the title and button also show up correctly.

Notes:
I posted this separately from MC-303283 since it’s a different issue, although both issues are about sprites rendering incorrectly in dialogs.