Off hand bow shots don't show bow name

When shooting a tamed, named pet or a player with named bow in primary hand, the kill message shows the bow's name as usual.
When shooting a tamed, named pet or a player with named bow in secondary hand, the kill message does not show the bow's name.

How to reproduce:
1) Create a named bow
2) Create a named, tamed pet or invite a player
3) Try shooting the target with secondary hand