We aint repairing a new mower, someone is going to be accountable for this screw up.Definitely spray the tire, rim, and Schrader valve with a heavy soap solution.
If nothing shows up immediately like bubbles, wait a few minutes. Thats when a bead leak or a bad rim will show up.
We live in goat head country. None of our mowers or ATV's will keep air unless we install wWe slime in the tires. Fixes bead, rim and bad tire leaks.
I'll make darn sure or that, I promise.