The air bubbles that appear above the hotbar are misaligned by one pixel. This is because the offset in the hud_screen.json file is 179 instead of 180.

This issue affects the vanilla resources and all texture packs. The Halloween Mash-up was used to demonstrate because the misalignment is more noticeable with full-width bubble textures.

Expected Result

Bubbles are aligned perfectly above the hunger bar.

Observed Result

Bubbles are one pixel to the left of their intended position.