Grenades and the support gem "Long Fuse"

The wording of the support gem "Long Lasting Fuse" says the following:

"

Supported Grenade skills cannot explode before the end of their fuse duration

But this is innacurate. Explosive shot can still trigger the explosion. While I have no problem with this being the case, it's either a bug or the wording is off. I don't know of any way to trigger the explosion early without explosive shot, so the support gem seems to adress specifically "Explosive shot".

Kind regards, Lio.