I figured this one out for myself a long time ago having to repair a piece for one of my installers although since I have seen a couple others that say they knew about it
Occasionally you will be pulling panels for various reasons (2 door accord mid 90's up comes to mind in tinting) and those friction clips or pop out types don't want to release. It's not always easy to get something behind them and you slide your hand in and pull it from the back and in doing so it just slightly bends or creases the plastic. It leaves a little white mark where the stress was.
Next time this happens, as long as you didn't damage beyond repair, take a micro torch and VERY lightly heat it. This is not so much for putting it back in place as it is removing the white stress mark it left. I have done this several times over the years on pieces that got bent in removal and it worked great. couple you could barely see, the rest were like magic and gone.
Heat guns work too, but the heat is not concentrated enough so it's a little tricky to do it without damaging something else.