On the Bedrock Edition, the raid bossbar UI is color pink instead of red like on the Java Edition, it was stated that the bossbar would change in a future update. It was stated here.
Linked issues
is duplicated by 4
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Comments 12
Loris: The bar is still based in the quantity of remaining mobs, instead of the total life of the pillagers, that should be a separate issue.
A shame this is still limited to 7 fixed colors. (PINK, BLUE, RED, GREEN, YELLOW, PURPLE, WHITE)
Missed the opportunity to add RGB support, as it is already the case in resource packs
Made a new ticket for the bar style (notches) here: https://bugs.mojang.com/browse/MCPE-149499
Unfortunately, color isn't the only value that was ignored. I made issue MCPE-143064 a while ago (before I even knew that this specific issue existed) which has the remaining ignored field listed.
This is intended.