AirPrint stopped working after upgrade to iOS 12.0

I cannot print from Notes on my iPhone 6s+ since updating my phone to iOS 12.0 and I get the following error: No AirPrint Printers Found. My bonjour printer settings have not changed, and my router settings have not changed. I have tried 2 printers so far: a Canon MX512 and a Canon MX452. I actually noticed the MX512 stopped working a few months back, although Airprint was definitely still working with my MX452 until the most recent update. Both printers work fine with my laptop. **What could be the cause/how can I fix this?**