Why do apps paste from my clipboard as soon I open them (without manually pasting anything)?

I have a Google Pixel 5a running the latest version of Android 12 (I updated a couple of days after I bought it, so I didn't use Android 11 much if at all). I noticed that a lot of apps trigger the "app pasted from your clipboard" as soon as I open them. These are legitimate apps like Here Maps or Firefox Focus , installed directly from the Play Store. Importantly, I am not doing anything to trigger this manually. No long press and hitting paste, nothing. I'm worried about this for security reasons, obviously, but I've checked my permissions and they all have minimal permissions. Here Maps, for example, only has location access and nothing else. Why is this happening? Is there any way to debug this or see what's being pasted or why? Or to disable apps from checking the clipboard without my explicit permission?