I'm a US citizen working in Finland. I'm waiting for my residence permit renewal to be processed, which takes quite a long time. (Recently, it seems that the turnaround time is over 120 days. I don't know if this estimate includes the fact that nothing at all will happen in July.)
There's no problem continuing to live and work while I wait, but it is unclear to me whether I will have trouble traveling within the Schengen area as well and entering or exiting. (In particular, I've agreed to go to events in Canada, France, and Germany for work in this period.)
My question is whether the 90 day visa waiver applies to US citizens whose residence permits have run out. (This would solve my problem in a practical sense.)