I traveled to Paris last year from London on my Indian passport with a Schengen Visa (From the French embassy). I am a UK resident with BRP. As my visit was via bus and the immigration officer was in a hurry to clear the bus, he didn't stamp my passport stating when I entered France.
Now when I made my last visit to Italy this summer, I was interrogated on arrival because I got an exit stamp from France, but no entry stamp. They were worried that I might have overstayed during my last visit, which is not the case.
Now I want to apply again to France to get another Schengen visa (mine expired last week). I am now worried that they might reject it for the same reason.
Shall I be worried? It's not my mistake, I didn't know then that I needed to get the passport stamped.
Edit: I stumbled upon this article, https://travel.stackexchange.com/a/76574/90955 It looks like french immigration officers do miss stamping quite often. Hope this wont be blocker, if someone can shed some light that would be useful