The bug

When trying to view certain game objects through translucent regions of an allay or vex, they just don't render. Examples include but are almost certaintly not limited to:

• dropped translucent items
• placed translucent blocks
• clouds
• beacon beams

How to reproduce

Create a setup where any one of these things can be seen through these areas of the allay/vex texture. The follow commands will be useful:
/summon minecraft:allay ~ ~1 ~

/summon minecraft:vex ~ ~1 ~

Expected results

the thing to be visible

Actual results

It is not.