well, I don't know..
the same was said with holding click and pressing space button, apparently when i played 0.4.7 this was fixed.
i didn't have in mind at that time that this bug would probably be fixed as well, lol if i recall shotgun was a lot better, so was stubby (when i played in CTF 0.4.7)
devs will have a fix for this anyway.. i took into account the broken anim that happens after repeated crouching is the fault... which is only a problem of the improperly fix of C-glitch sliding (as you said, 0.4 came with a whole new sync, rewritten minus the crouch sliding, like we played in Vice war 4)
also i have to add: the same bug was happening when a player was shooting like this rapidly, but only with fast switch, his shots were not coming out, later it got fixed.. which turns out that there's a chance that not the ghost shot is the problem here..