There has been similar damage reported on here from mudhuggers where the ties wore through the helitape.
The important points are:
We ride our bikes through grinding paste, anything with potential to move a little needs removing and cleaning under before the constant slight movement causes the grinding paste to wear through the paint and below
and,
Helitape is not a magical forcefield, it only slows the process down. It will still get worn through if left long enough.
At O/P, bad luck… upside, from MisterAST’s comments it looks like you may have caught this in time.