Does .de reg date reset when you transfer out to new registrar?

Recently transferred out .de domains. I really should pay attention to the dates. I checked recently after transfer a bunch of .de domains out of GoDaddy to Dynadot.

I see that the .de domains reg dates have been changed. They were registered since 2016 and now they show 2019 they were regged. The date when they were transferred.

What is going on here?