Mythril bow(with or without diamond arrows) glitches someone in creative mode with a spam death animation, and on player kill deletes inventory.

To Reproduce
Steps to reproduce the behavior:
Mythril bow w/ diamond arrows
Shoot another player
Inventory deleted

One shot player, but don't delete inventory.

Screenshots
https://imgur.com/a/2UV7LvF

Info (please complete the following information):

• Modpack Version: 2.77.5
• Server or Singleplayer: Server
• Version the world was created on: 2.77.5

Additional context

Does the Mythril Bow have any enchants? And are the arrows tipped?

Oh yeah I meant to include that. It's enchanted the same way as it was in my other post about the bow:
Power V, Quickdraw IV, Infinity, and Unbreaking I.
The arrows are not tipped, just plain basic diamond arrows

Cannot reproduce reliably. If the bug reoccurs on 3.0, feel free to reopen it.