Some of the contacts disappeared from Galaxy A52. Fix?

[Mqtteo]

As the title says, some contacts dissapeared (maybe a third?). For example, when I go to call log (recent calls) some calls have contact information while others show up simply as numbers (even though I know that I had saved that number as "Mom" or "work" or etc.). Any way to fix this?

[xSteveuk]

Hi,
Try Below

Go to Settings > Accounts and tap on your Google account. Tap on Account sync and look for Contacts. Now, enable the toggle next to Contacts and if it's already on, turn it off and on again

[smg1]

Who have you synced with Samsung or Google? Restore any backups you have with Samsung and Google. I hope this solves the issue?

[adadas]

Same thing happened on my Samsung A52s after upgrading to Android 12. I found that my contacts are deleted randomly. And the deletion happened repeatedly. 

Not sure it is the problem of Samsung or Google...