When a player dies in crawl mode the items in their hand, off-hand and armor slots drop 1 block above their actual head height (often inside a block), this causes the items to move upwards until they reach an empty space, potentially causing the items to be lost. However this issue does not seem to affect the rest of the inventory.
To recreate the bug; Get into crawl mode and crawl under a block with at least 4 other blocks surrounding on each side creating a + shape (this forces the items upwards), then die and notice how the items that were in your main hand, off-hand, armor slots and your exp. end up above the + shape while the rest end up below it.
We're tracking this issue at MCPE-189234, so I will resolve and link this report as a duplicate.
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