" nor the direct update" means manual installation via command line "adb sideload e-1.9-s-20230311268558-dev-gauguin.zip, right?
Warning: Please note this upgrade build could not be tested as there were no device specific testers available. Some devices may need a revert to stock ROM prior to upgrade. To flash the stock ROM you would need to use a tool provided by your vendor. You may also need to download a recovery image built specifically for your device
This notification was also released for the OnePlus 7T Pro (hotdog) - and I did not have a good user experience.
PS: Only at the end of this week I can try the reinstallation on the “gaugiun”, because I’m still waiting for the Xiaomi bootloader unlock