start a game, then just noclip to a pedestal with infinite rocket launcher, grab it, fire it -- and no rockets/projectiles are fired, just kind of puff-like animation (and no monsters hurt of course)gzdoom.exe -file boscp.zip
If the above is done using gzdoom-4-10-0-Windows-64bit.zip, then everything works as expected.
A couple weeks ago I saw the same issue with "grapesoda.zip" and its "pink lemonade BFG" or whatever it's called, then thought the map is broken and didn't investigate. Now it looks like a systematic issue. I'm new to reporting a bug here, sorry if anything is wrong, or it' a known issue, but I can't find similar reports at 1st glance.