when you put items in a bundle that is inside a chest then you brake the chest, the items inside the bundle disappear
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duplicates 1
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This issue is being tracked at MCPE-188043. If you are able to provide a video of the issue and repro steps, that would be helpful.
It appears that items can be deleted from bundles after placing them inside a container (any) and breaking it, according to MCPE-191579.