H1B visa new extension v/s existing approval extension

Can anybody please suggest on below scenario -?
A guy is having valid h1b visa until September 2022 and per rule he can apply extension before 6 months.
If he would apply the premium extension in April and incase unfortunately the results come denied so, would he be able to stay until September 2022 based on his current approval notice or he has to go back .

Any inputs would be highly appreciated.

You can work till the expiry of current I-94 if your extension is denied.

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