Pattern lock code is not recognized after updating to 2.6-rc [Samsung Galaxy S8 / dreamlte]

Alternatively I see that 2.6-rc-s is in testing at present. We are told

If this were the case this should be dealt with in the testing channel.

You will find a link within the full quote

Testing channel is controlled on device by:

  1. Enable Developer Options on your device
  2. Use the test channel
  • Settings > System > Advanced > Developer Options
  • Scroll down to the end of the screen
  • Enable the option Connect to /e/OS test channel