Empty part of a boss bar is always gray

Summary:
After the Raid Boss Bar UI turned red in 1.18.0.20, the Ender Dragon's Boss Bar turned gray in the empty part instead of dark pink. This also applies to the red Raid Boss Bar, in the empty part it should be dark red instead of gray.
This is also a parity issue with java edition.

Steps to reproduce:

1. Summon a Raid/Ender Dragon.

2. Make the Boss Bar not full.

Observed results:
Boss Bar in the empty part is gray instead of dark red (Raid)/dark pink (Ender Dragon).

Expected results:
Boss Bar in the empty part will be dark red (Raid)/dark pink (Ender Dragon).

Screenshots:
after 1.18.0.20

before 1.18.0.20

java edition