Campaign UTM (name) historical data is wiped out while conversion classification rules are working fine

Hi community,

I have a question regarding Campaign UTMs data. The campaign data was populating correctly till yesterday. When I checked the campaign report today, all of the historical data is wiped out and showing 'unknown'. 

But a new dimension 'Tracking Code' contains all the campaign data. I just wanted to inquire is there any new update regarding campaign tracking or tracking code or is there any other way to sort this issue

(Attaching screenshot for your reference)

Thanks