Mastery: M4 Gold (Call of Duty: Modern Warfare 2 (2022))

Opened the golden skin on M4, in the "Skill: Gold" tab there is a task to kill 100 opponents with a golden skin. Applied the skin, killed 100 opponents, but nothing opened. Has anyone experienced this?
UPD with Kalash is the same garbage, but if you go to the selection of business cards, then there are business cards for the golden test