I just got this same bug. I have two rooms with double chests oriented in a side(single block) view from where the player stands, which in the middle of a blocky chest sphere and every chest within the players relative clickable range. All items that were in the bottom half of the chest contents screen are now gone. I thought I went crazy at first, thinking I had misplaced some gold and iron blocks I needed for a beacon. But after looking through every chest in game, I FINNALY noticed a pattern haha. Just as op said, ender chests, shulker boxes, barrels and single chests are unaffected. Using MC BE(beta) on XBO.
I just got this same bug. I have two rooms with double chests oriented in a side(single block) view from where the player stands, which in the middle of a blocky chest sphere and every chest within the players relative clickable range. All items that were in the bottom half of the chest contents screen are now gone. I thought I went crazy at first, thinking I had misplaced some gold and iron blocks I needed for a beacon. But after looking through every chest in game, I FINNALY noticed a pattern haha. Just as op said, ender chests, shulker boxes, barrels and single chests are unaffected. Using MC BE(beta) on XBO.