Right.
So technically your original return is wrong, because, as I'm sure you know, the income should have been reported on line 1 of your 1040, not on Schedule 1 Line 8z or wherever you ended up putting it.
I don't know if the IRS computers will attempt to match the W-2 they received with your 1040 line 1 and send you a love letter because the number you reported is too low by the amount of this particular W-2. They may just look at your total income and see that you reported enough there (because by then the Other income number was included).
If I were in your shoes, I would not file an amended return, because I'd feel silly sending in a 1040-X which has no changes on any of the lines on it and an explanation that I'd reported some income on the wrong line.
I would write notes as to what happened (it's easy for me to forget the details after some time has passed) and then wait to see if the IRS sends you a letter. If they do, then you can likely reply with an explanation and they should close it with no issues. If they don't, you've saved everyone time and hassle over a technicality.
But other tax folks might have a different, and better informed, recommendation than mine.