[1.16.5] Style 20 bossbar changes texture when enabled

[Spectrall368]

Minecraft Version: 1.16.5

Forge Version: 36.2.39

Steps to Reproduce:

1. create a bossbar (/bossbar add test "test"), /bossbar add testtwo "test_two"
2. then use /bossbar set minecraft:test players @A, /bossbar set minecraft:testtwo players @A
3. then use /bossbar set minecraft:test style notched_20,
   4, /bossbar set minecraft:test visible false, /bossbar set minecraft:testtwo visible false
   5, /bossbar set minecraft:testtwo visible true, /bossbar set minecraft:test visible true

Description of issue:
Style 20 bossbar changes texture when enabled

[Spectrall368]

I've noticed this bug exists with every notched bossbar style

[BigBigZhe]

This bug also exists in Minecraft 1.16.5 vanilla. But in Minecraft 1.20.x this bug dose not appear.

[embeddedt]

This is https://bugs.mojang.com/browse/MC-165036. It was fixed in the first 1.19 snapshot.