Explosives like grenades and bazooka bypasses claims
FTB utilities claims
Even tho explosion protection is turned on

Not sure if this is still an issue in the recent development versions. It should work according to https://github.com/FTBTeam/FTB-Utilities/blob/7eb169af30ba0532c0f37cf291b97aa9c1e0e230/src/main/java/com/feed_the_beast/ftbutilities/handlers/FTBUtilitiesWorldEventHandler.java#L77 as the explosions in the gun mod call the normal forge events. Reopen if still an issue on the latest update once released.

Edit: I found the problem. 1.12 just doesn't call the detonate event as it's a custom implementation. I will do one last update for 1.12 once I have released this new update for 1.16.