This bug has now happened to my server mates and I no less than 12 times. We have lost so much and the more it happens, the less we feel like it is worth continuing to play this game when all of our time in it is wasted when we lose resources to something we cannot plan or account for.
We had this issue occur on our server. The chests and shulkers effected were completely invisible and inaccessible. Breaking the chests drops no resources, breaking shulkers crashes the server. You need to break the shulker with a piston to remove it. You dont get it back. Hours of resources vanish with this bug that can occur without much reason. Please fix this.
This issue is also affecting slime blocks, when bouncing using the blocks it will cause the player to snap to another block, in some instances this will prevent the player from bouncing on slime blocks at all. If several are side by side it is as if the player was snapped into a different place and pushed up and down
We got the screenshot from my friends Xbox but it did happen on my PC as well
Please Note this bug is still affecting all tools using the Unbreaking Enchantment as of 1.16.100. If Unbreaking is removed from the tool in question instant mine and mining in general is possible without block lag on all levels. Please correct this, this issue makes doing a core part of the game incredibly frustrating.