Relates to MC-165036, a boss bar texture that uses transparency doesn't show its transparency if other boss bars are present. The example in these images shows that the transparent black bar behind the boss bars doesn't render on all boss bars below the first.
Steps to Reproduce:
1) Use a resource pack that has boss bars with transparency
2) Summon an Ender Dragon and summon a Wither (the second one summoned will always have their transparency unsupported)
[media][media][media]Linked issues
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Please change to confirmed since I've provided the screenshot with F3.

Could you please add steps to reproduce this issue?

Just did

Please also attach the resource pack or a link to the resource pack.

Just added it, please change to confirmed.

This seems fixed in 24w12a, can anyone confirm?

Can confirm this is fixed in 24w12a.
Please attach a screenshot of this issue occurring with the F3 screen enabled.