Hi
I’m no Google expert(I’m actually more of a apple person)
But from my experience with repairs pressure on the screen(books or weight)can damage the internal screen but it’s rarer than once in a blue moon and it’s quite normal to do that to help seal the phone
But we cannot rule it out,have you tried restarting the phone.
If that doesn’t work try draining the battery
Because when battery’s and other things are plugged in and out it can cause static and cause things to “play up” and draining the battery and charging it again can help sometimes or at least that’s what I found helped when I replace batteries on old iPods
Hopefully this helps,if it doesn’t please do not hesitate to ask but like I said I’m quite limited with Google’s and androids but I can try my best
Thanks:)