Here is a message from Zidoo posted on the forum:
We received a possible playback bug feedback, so we paused the push, we have a five-day holiday, see you in five days！
mirror, 2021-05-01
Zidoo has stopped the OTA distribution. So keep in mind like with every beta. Use it at your own risk.
Btw it’s always wise to do fully turn off/on power at least twice after firmware update .