why can't you sell untraceable players but you can buy them

Product: EA SPORTS FC Mobile
Platform:iOS
What's your device's make and model? iphone 13
What's your device's firmware? idk
What is your game version? eafc24
In what game mode did the bug occur? Store
How often does the bug occur? Often (50% - 99%)
What happens when the bug occurs? i can't sell or trade a player
What time did you see the bug? (HH:MM AM/PM) all the timer

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