This feature works correctly with some colors, but not with others.
For example, players in yellow (&e) team, with their names in yellow in tab, have their outlines in pink.
Players in dark blue (&1) have theirs outlines in green.
Players in pink (&d) have theirs outlines in yellow

("Joueur" = "Player")

Thanks for reporting this! Will be fixed soon.

This issue is fixed! Uploaded the jar to Curseforge as v1.2.4.