As in the video, when I use OreUI, no matter what method I use to return to the operation (including the game's own return key, the system's return shortcut), the game will not respond, but it does not freeze. This does not happen in JsonUI. This has taken a toll on my day-to-day operations, and I had to restart the game to get back to the upper menu.
This issue is being tracked at MCPE-221980.