(This is a duplicate bug, sorry for the inconvenience)
While playing local split screen multiplayer with other players, we have come across an issue, regardless of what console we play Minecraft on, if one player has any GUI open at any given time (e.g. inventory), then the crosshairs of other players on screen will either flicker or disappear entirely until everyone has exited their GUIs.
Linked issues
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Duplicates MCPE-123918