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Dear Gutierrez Alfonzo,
Thank you for posting in Microsoft Community.
Based on the description, you want to stay the list 1 values lookup from list 2. Unfortunately this is expected behavior that once the list 2 value has been updated, the list 1 using lookup column will be updated too. I would suggest you to submit a Feedback for this feature to retain original value of lookup column.
You can check the previous value of the item from lookup column by checking the version history. Click on the vertical ellipses button beside the item > click on version history > click the drop down arrow then click view.
We look forward to your response. Thanks for your kind understanding. Stay safe and healthy always.
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Sincerely,
Zee | Microsoft Community Moderator