How to fix Contacts app crashing after OS Golden Gate 27.0 update on MacBook Pro M2?

I had this issue too.

What I did to fix it was;

1. Open the Contacts App on the MacBook Pro
2. Click on the + symbol in the top left corner to open the left navigation side bar
3. Click on the Mobile contacts (this populated the empty right panel with contacts)
4. After step 3, click on All Contacts at the top of the list (right window now stays populated).
5. Close the Contacts App and reopen, it now looks like it used to

Note: before doing this I did check for duplicates on the iPhone (as suggested by BobLo) and merged two that were found to be duplicated.

I tried all the suggestions posted in this forum and elsewhere online, none worked for me so I looked around and realized that my most used contacts were missing from my iPhone Contacts. Assuming that it was related and not coincidental, I clicked on the groups on the left side of the iPhone Contacts app and when I clicked on the iCloud group I got a message stating that there was a duplicate contact, I clicked on merge and all my problems disappeared, the Contacts app on both my iPhone and Mac went back to normal. I hope that helps others.

UPDATE FIXED:

I tried all the suggestions posted in this forum and elsewhere online, none worked for me so I looked around and realized that my most used contacts were missing from my iPhone Contacts. Assuming that it was related and not coincidental, I clicked on the groups on the left side of the iPhone Contacts app and when I clicked on the iCloud group I got a message stating that there was a duplicate contact, I clicked on merge and all my problems disappeared, the Contacts app on both my iPhone and Mac went back to normal. I hope that helps others.

There's definitely an issue with more than a small amount of text in the Notes field. My work around was to delete the plist file and restart the computer. It worked until I accessed a record with a few lines of text in the Notes field - my work around at the moment since Contacts still crashes if one tries to access a comprehensive record is to navigate to: home/LibraryApplication Support/Address Book/Metadata. This folder includes all your Contacts records but it is not organised so it requires checking through the items in there to find the contact you are looking for. Not too bad if you don't have a large number of contacts and as a fall back it means at least one can hopefully find the info needed. That said - I hope Apple can fix this and soon

There is another post already in this forum wit the same question, some people say that turning iCloud syncing then turning it back on helps them but it did not work for me.

Then there was another suggestion that removing the PLIST file, rebooting then launching the Contacts app helped them restore normal operation but that also did not work for me.

That did not work for me.