It is fine.
Mine has one nasty deep one and still runs fine,
not ideal of coarse,
but if the bearings give up expect to see much much worse!
Worry about it then.
its obvious that you need also oil rings , you know that don't you?
how many hours with this set of piston and rings?
its a pitty, it would only be 10 minute job, if it was an old style motor of course
Last summer i ended up with broken valve spring and valve hit piston pretty hard.
Now i have WÖSSNER piston in, i hope my mechanic install piston with new oil rings.
With this new piston i have 15h max.
if it does not smoke heavily then (because many woessner pistons have problems in the oil rings departement) , they still did not run in on to the liner. ussually it takes 25-30 working hours.