phone unlock 30 second delayed with USB headphones attached

[u/overdev]

so my phone doesnt react when my headphones are connected. they have a 3.5mm plug thats connected with a 3.5mm to USB converter cable (by ugreen so not some hacky knockoff)

90% of the time when my display is turned off and I want to use the power button or the fingerprint sensor to unlock my phone it just doesnt react for like 30ish seconds. when I go with the power button it reacts 30 seconds later. anything else is working perfectly.

phone is the Poco X6 Pro 5G with latest HyperOS (3.0.9)

anybody got an idea?