Originally Answered: Will my approved F1 COS void my current L1 Status?
If you are still working, you have already violated the terms of your F-1 status. The day your application for a change of status was approved (it's not a petition), your L-1 status ended and your F-1 status began. You cannot be in two non-immigrant statuses at the same time. You are now in the F-1 status.
You are no longer in the L-1 status. If you are working, you are working illegally. If you are working illegally, you are subject to arrest and removal.
If you worked for a single minute while in the F-1 status, you are now out-of-status. You cannot work tomorrow, let alone until the end of July.
You are not eligible for reinstatement as an F-1 because you engaged in unauthorized employment. You are currently out-of-status, deportable, and have no way to fix it without leaving the U.S., obtaining an F-1 visa, and returning as an F-1 student.