After set gamerule mobGriefing false
and summon some fieball and shoot it
it not damage player
it not damage block
it not damage any item but make player and item flew away
but it damage another mob
example zombie
Related issues
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Wait that was new feature in 1.9? isn't it?

Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.
What's the exact command you've used ?