Yes, you are technically a permanent resident already.
For now, your green card has not been revoked. There is a possibility that it could be because you never worked for the employer. However, it's possible that nothing will happen. For now, you are a permanent resident still so You are allowed to search for a new employer. You don't have to make any claims. You have not done anything wrong. You are not tied to your previous employer.
Good luck to you during this process and I hope this answer has helped you!
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