[Problem] Floating coating when using 5C to print

[TheSatchel]

Version: 1.6.3-1.6.7
When it happens and steps:

1. Using 5C mode.
2. Turning on the coating
3. Loading the target images
4. The color in extend 1444 colors were used.
5. Output as 3mf and sliced in bambu studio
   Desired Outcome:
   No floating coating in 5C mode and being able to print downward.

[TheSatchel]

Possible solutions have been proposed. #217
If it can be adapted, I would appreciate it.