Any item in the mainhand will be the one that registers the kill in chat. Thus, any item such as the crossbow or bow that is used to administer a kill while a named item is in the mainhand will not be counted as the cause of death.
MC-255955
Killing someone with weapon in offhand returns chat message as if killed by item in mainhand
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We're tracking this issue in MC-89347, so this ticket is being resolved and linked as a duplicate.
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