Disabling certificate validation loops when using locally trusted root cert

[cbrnrd]

Bug Details

I am trying to intercept some traffic on my iPhone using mitmproxy. I've installed the root cert generated by mitmproxy and have fully trusted it on my device and confirmed that other normal traffic functions normally and is trusted. However, when opening the ProtonMail app, the following prompt shows up: . From glancing at the code this is expected since cert pinning is being used. However, when the "Disable Validation" option is pressed in the popup, it opens the same popup again and never sends a request. This loop continues for a few times (somewhere between 2 and 6 times), then this popup appears:

This toast appears at the top of the screen each time a popup occurs:

Is this looping expected behavior?
To me this seems to be a bug as the expected behavior would be to disable certificate checking when the "Disable Validation" option is pressed.

Please let me know if I can provide any additional details or do any other tests :)

System information

• App version: 4.18.0 (10270)
• iOS version: 18.2 (22C5142a)
• iPhone model: 13