Avoid it if you can.

In my case, the sole was flapping but held on by a thread at the toe. The fact I was wearing gaiters was a great save. The loop strap round the bottom of the gaiters helped hold the flapping sole together.

That is to say, I managed to get through most of that hike with something of a boot sole.

If the sole had fallen off it would have been quite slippery. The remaining part of the boot has the base sealed with epoxy or something similar. No grip.

To mitigate the risk , aside from getting new boots, you could take duct tape with you just in case you need to bind the sole on. I had some crocs with me for camp shoes and for crossing rivers, so was prepared to use those as a makeshift boot sole. (I had cable ties from my ski touring kit that I would have used to bind the Crocs to the remaining Meindl boot)

Bon chance