wkwebview: submit buttons not working after temporary connection loss - wkwebview

i have a web view and one of the sites it may display contains a form with various submit-buttons. Now the problem is that when the customer looses and regains connection while on this site, none of the submit buttons seem to work anymore. The request is being sent(decidePolicyFor navigationAction is called) but then nothing happens...
When using the normal chrome browser it worked fine.
I could repoduce it while being in their (guest) network, but not at home in my private network, even with giving the device a different ip address...
edit: after overwriting didFailProvisionalNavigation i noticed that it does get called with the error "The Internet connection appears to be offline."
But normal links work and i can't reproduce it in the other networks that i have access to

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