Upvote:0
Is there a chance you could end up technically overstaying in the country even though you are no longer there anymore?
Generally, no. Technically, your stay in a country ends when you cross its borders. One might be administratively suspected of overstaying if there is no exit record, but technically you're out of the country so you're not overstaying. The laws I'm familiar with (which admittedly do not include China) penalize people for staying in the country too long. The lack of an exit record may be evidence of staying in the country for too long, but it is not of itself a violation of any law.
Would there be a way to correct this if that happens?
In the US, there's an address you can send your evidence to. In the EU, you can bring other evidence of your travels with you in case you're stopped at the border. I don't know about China.
Upvote:5
It is very unlikely that you would be permitted to leave China without going through Chinese exit passport control (and therefore getting an exit stamp). An evacuation flight does not bypass passport controls in place by the host country.