I too have lost ALL my events after a Windows 11 update (I play on desktop app, and the CCFS version is 4.9.1.0).. This is the first time EVERYTHING has disappeared. for me. No more Sweet Streak (which had approx. 20 days still to run), along with Bubblegum Troll and my Dachs Delivery event, and I was in the Cookie Challenge (with 1 of 4 wins).
I have reported tis several times, how do i fix.. Ive tried all of your suggestions before to no avail..please help.