The bug

The charged / powered outline of a creeper makes clouds, entities and water invisible

1.16.5:

21w10a:

Here another image showcasing wrong rendering of entities and water

How to reproduce

1. Summon a charged creeper with /summon minecraft:creeper ~ ~ ~ {powered:1,NoAI:1}
2. Spawn entities & Place water
3. Look at the entities behind the charged creeper
    The entities(spawned after the creeper), water and clouds are invisible once behind