So here I am, running around with an M91 Bayonet slapped on my hotbar at #1, and a CR527 on slot three, nothing else on my hotbar.

I see a zed, pull press 1, pull out my m91, and I begin swinging. On the 3rd swing, my bayonet turns into a CR527 with no weapon switch animation, and I hear a click. I pull out the M91 and kill it.

'Nother zombie shows up, same thing happens. 3rd time this happens, I get a bit upset that my hoodie is ruined, so I try removing the CR from my hotbar, didn't have any ammo for it anyways. Huzzah! This seems to fix said issue.