When using a boat to move around on water, holding forward (W on keyboard) and pressing the dismount button (L-Shift on keyboard) while the player's hands are not shown causes those items in hands to never re-appear, making interacting with blocks such as chests and crafting tables impossible.
Video of issue happening: https://streamable.com/g4uv5s
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However, we are already tracking this issue, and this report is a Duplicate of MC-186085.
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