Hey @evaldsurtans thanks for reporting this! I will look into this tomorrow and see if I can reproduce this issue. You definitely shouldn’t have lost the tracking data for your previous emails.
One possibility—in order to see the opens / link clicks on your sent mail, you need to be looking at the copy you sent. If you CC yourself or BCC yourself, or have the email arriving in another email account you own, those versions of the email won’t show the tracking status.