Beacons do not work. They cannot accept any power. The selection is unclickable and doesn't work even with a full pyramid underneath. The slot for item that powers it works just fine, but when clicking that tick to power the beacon, the beacon does not get powered and the item gets deleted.
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Can you press F3 and check if the height map values are correct? I know that the height map was corrupted when upgrading a world to 20w17a, so this might be a symptom of that (see MC-179952).
Previously placed beacon blocks got broken in this snapshot, just mine and replace the beacon block and that will fix the issue
Do the beacons have sky access? Try placing a block above the beacon and breaking it again.