I am wondering if this happens to most people and that because I am so afraid of it I notice it and catastrophise it more.
I would say ^^^this^^^ is probably dead in the black.
Because if I parked badly and someone left a note? My response is usually

“Sweet! Thankyou random person for not having my car towed!”
As opposed to getting so afraid of being called out that I not only cannot feel the relief of my car still being there, and gratitude at the person who gave me a free pass, but so far distance myself from the situation as to deny any wrong doing.
And I say that not as a “what if” but I have, a few times, just stood next to my car and waved my arms and shouted THANK YOU!!! IT WAS AN EMERGENCY!!! No sarcasm, big grin on my face, really trying to let the person know I appreciate the solid they did me in
not towing my car.
A few other times, where things like double parking are the norm, and this is clearly some out-of-towner who doesn’t understand double parking etiquette? I just shrug, crumple it, and go about my day.
In both cases, I’m in the wrong... one solidly = gratitude.... one eh/greyish = DGAF unless you’re a cop (but a cop wouldn’t ticket me as long as I was following the etiquette/spirit of the law, and not being an asshole to them or others). No catastrophizing, no distancing.