What's the date code on those tires?
I've had too many issues with good tread but old tires coming apart.
I can think back a few years ago someone got a Bronco and took it to the Stampede. They got it running and the tires held air. At the end of the night there was a call for stock sized tires. All 4 tires blew out on the trail.
Also old tires loose a lot of grip. I remember being in Moab watching an old man rig, one that was built years ago and not touched since. Struggled and spun tires on fairly mild climbs. Even had well worn bypasses for what couldn't get up it. But stock rigs on factory tires (that happen to be new) would stick.
A couple months ago out trials riding there was a guy who brought out a vintage bike and ride it. Back tire was brand new but several years old. It would slip and he crashed multiple times. The rubber was too hard and didn't stick.
The list of old tire issues I have delt with could go on for weeks. Stuff blowing out in the middle of the night while parked for days. Stuff lost on the road. And the common factor, all were old tires.