This is from the offical Google big thread found here: https://issuetracker.google.com/issues/68450197
After changing the APN Type string from 'default, supl' to <blank> for the internet APN in mobile network settings tethering unexpectedly works again. Not clear how these settings got there (part of the 8.1.0 upgrade?), but it works for now. Just for the record: This was on Australia's Telstra network.
WiFi tethering problems after a software update can seriously disrupt productivity, particularly for students and remote professionals who depend on mobile hotspots. This APN adjustment appears to be a practical temporary solution until an official fix is available. A reliable internet connection is especially important when accessing the best class help service and keeping up with online coursework without interruptions.
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