I’ve been seeing Annotation rendering issues within the web Calendar for months now - seems to occur when Annotations are “stacked” more than one/day - “mouse-over” brings legibility, but possibly temporary depending on the level of stacking:
I’m running Chrome on my home PC/Laptop but on Windows and have never had an issue. Perhaps its something in your display settings on the Chrome OS :-/
Beats me - no other websites have ever manifested anything like this, just the TR Calendar with stacked/adjacent annotations - and across different Zoom and Display size settings
Not the end of the world though so will carry on ignoring it!