Exit entry bureau posted a notice online that they revoked my (working) resident permit

Mentor, since you already ended the contract with your previous employer, they were able to report to the bureau that you weren't their employee. You should understand that your resident permit was acquired due to your previous employer. After they reported the situation to the bureau, the bureau has the right to cancel your resident permit.

What you should do now is to visit the entry and exit bureau in the city where your new employer is settled at and require to apply for a temporary L type. Then you can stay legally. However, I don't know if you are able to apply for the new Z type and resident permit without leaving. Please consult with the bureau too.