I was just practising offline with a standard Shopper scheme when my turn ended suddenly after activating a dud mine and (safely) detaching from the rope.  Screen capture from the replay here : https://gofile.io/d/qEess3

Using 3.8 Steam version
Wormkit modules: WormNAT2, Super Frontend HD, Remap Keys, wkNewWave

Have I missed something or is this a bug?

Looks like you've bumped your head man

I did think that but it was so slow and thought there'd be an 'ow!' sound effect.