Hi, I am new to the forum.
I have been collecting Playmobil for decades, and it is only on the last few years that I found (a) a poorly molded, misshapen part and (b) missing parts.
I am pleased to say that in both cases, Playmobil replaced the parts when I e-mailed them.
I also often find extra pieces in the Figures blind bags, but fortunately never a missing part.