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ANSWER: You need to go to a local USCIS office to speak with an officer about getting an I-551 stamp in your passport, extending your current PR status for 1 year while the I-90 is processing.
You can make an appointment here: infopass.uscis.gov. If you cannot get an appointment before then, go to the local office as a walk-in. You might end up waiting for the scheduled appointments, which take priority, but this is how to deal with this issue.
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