I just got on Mining and sent my wolf to Spooky Spires. Then I went down to the bottom of the page to look at my pickaxe when I noticed that my silver wheel was at 0%, but it was still working! I'm pretty sure this was a bug.
I had this issue as well, but with the Iron Wheel. When I clicked to mine again, the 0% wheel turned to 0.1% and then broke after that round. I thought it was a bit strange, but it possibly being a bug would make much more sense...
wheels staying at 0% during travel is intentional so that you can't switch wheels while using a wheel (it shows you the durability your wheel will have after you arrive), but there is a lot of weird behavior yeah