incoming call, answer/decline buttons showing on lock screen/phone

I'm using iphone 12 for one month and i have an issue with answering call. On lock screen/phone when i receive normal voice call i should get slide to answer all the time but sometimes by random call and random situation i get answer/decline buttons on the lock screen and phone is locked 100%. This is very annoying for me because i answer calls in my pocket. I read on some post that this is not happing only to me but also other people are reporting this bag. I try everything to see if some app is doing this but no result. Has someone found solution for this?