You normally add only those forms which changed to an amended return. If your W-2 did not change, then don't attach it to your state return.
If the state wants your W-2 (which they have from your original return anyway), they will ask for it.
I am amending a 2018 MD 502X for a traditional IRA contribution I failed to deduct and Turbo Tax increases my exemption from 4200 to 7400. Nothing changed with my exemptions. Why did it increase?
What line on Form 502X are you looking at? Are you sure that this was the exemption amount? Does your IRA contribution amount equal $3,200 -- the difference between $7,400 and $4,200?
You can find Maryland’s Form 502X and its instructions here.
Please see this Help Article to assist with this: I need to amend my state return - TurboTax