The parts came out perfectly fine, and there was no damage to the mag sheet 🤷👍

I did this once on my ender 3, same no issue to the mag sheet but I cancelled the print only a couple layers in.

I cancelled the other objects that were supposed to print after, but left these because I thought any damage would be done already. Luckily, no damage and no waste!

What sort of probe were you using on your ender?

I had the klack ender from Kevinakasam which is a version of klicky made to work with a bedslinger. Very cheap and very good considering the price.

Zero click here - basically a klicky too! Fantastic if you don't feel like using a build plate.