After the update IOS 27.2 I lost my whole calendar activity in the last 3 years - every single meeting, medical check, hairdresser's...all of it!! I spent the whole evening following instructions on Chat GPT, Gemini, Apple..., tried recovery data from iCloud - nothing! The whole archive is gone even on iCloud!!! I am not an IT person, I followed the steps and everything seems ok on my phone, but apart from the holidays, all the rest is gone (except a few Zoom links that I received on my Gmail).
I hate this, I HATE it!