Most of the old boots soles came away too, if they were mistreated. Very few Vibram soles were nailed, screwed or sewn on. Only the mid sole.

The take home lesson should be

Don't dry wet boots by the fire.
Don't leave your boots in a hot car.

Either will cause the glue to release.

A fix that will work for several hundred miles is to drill holes thru the midsole and sole, (assuming you have the outside stitched old school boots) and sew them with bailing wire. Otherwise, twist wire into a basket under the shoe with loops up the side an inch or so that can be laced with cord over the top like crampon straps. I have had luck with hikers getting several days of use this way too. Duct tape comes off in snow and wears off fast in scree.

My favorite were the Pivetta boots. Best edging boot that still had lots of flex and breathed way better than modern mountaineering boots. Perfect CA high country boots for off trail.