Had this problem, started windows media player going in the background. Yep, at 40% sound shut off. Went back and song was still playing, but no sound. After a little while sound started back up. Went back into Minecraft, which had to reload, but it reloaded with sound.
The workaround might be minimizing Minecraft then getting it to reload. Might be needed each time Minecraft is started. A sound source might be needed to tell when ready.
Worked a second time after closing out Minecraft and starting it all the way back up again. Replicated.
Happened just now for me on Xbox Bedrock. Left or right on D-Pad made another screen come up that removed the unassigned screen box. Think it is not unassigned for normal controls but something else like emotes. For me, I had a chest open and a drowned hit me. Will try to recreate and open a ticket, but don't know how to recreate. Found a few instances on the internet of it happening.
Wondering if Bedrock wants to keep a default interaction menu open instead of the chest or anvil, but no way to back out since the default interaction menu has no assigned actions, such as B to exit. D-Pad controls the cursor, so could that also be unassigned?
Just got the "You Need A Mint" achievement randomly on Bedrock for Xbox. I might have opened a chest with it on another world (multiplayer). On that world I had, much before, raided a heart of the sea treasure, Potion of Water Breathing (3:00) and Potion of Regeneration (0:45). Was putting salmon on a campfire when I got the achievement, was hunting salmon and trying to grow a large spruce tree before or after it. (For reference, on my Deep Russian survival world.) (I have gotten the achievement normally on the Xbox 360 version.)
Seems to work in another world in what acts like the Nether in the infinite snapshot. Also works in the Nether in 1.17.1 (with cheats to place some water to start flowing).
The kelp creates a water source block wherever placed in water. One water bucket and kelp can create an infinite water source, if done right, no bone meal or growth time needed.
I have been having the issue, just tested it and yep, still there.
Steps to reproduce: Start an item smelting in the furnace. Deselect the furnace. Wait until it is done smelting the item and not lit up anymore. Open furnace, arrow icon is partially full and stopped.
Xbox Series S, v1.21.71