Could you provide repro with vanilla content please

Do you mean vanilla (2.06) build?
Or you about Spetsnaz223rdDetachment? --- this is vanilla insignia, see: Arma_3:_Unit_Insignia "Spetsnaz 223rd Special Purpose Detachment" from Arma 3 Contact (Platform)

Anyway a new video on 2.06.148221 >> https://youtu.be/LyWTdtCShaI

Thank you for the feedback, i was able to confirm the issue.
Unfortunately it's not something we can easily solve at this stage.

With lastest dev update insignia will not be lost after take off and putting on again for same uniform object.
But if unit put on new(other class name) uniform BIS_fnc_setUnitInsignia will return false and no imagine will show

repro please

1. place unit, exec player forceAddUniform 'U_B_CombatUniform_mcam'
2. exec [player, "BI"] call BIS_fnc_setUnitInsignia;
3. exec player forceAddUniform 'U_B_CombatUniform_mcam_vest'
4. exec [player] call BIS_fnc_getUnitInsignia;

result - insignia class name was return although no picture on clan selection

It is just a variable stored on player that the function returns, I will get rid of it