When searching within a web page (Ctrl-F) for a diacritic character like ‘å’ I get every ‘a’ as a result (thousands). That must be considered a bug.
Does seem like a bug; and, reproduceable. Yet, a workaround for now:
Copy the text, of the webpage, to a good quality text editor, and then search that text.
A good quality text editor for Windows OS users:
Just Great Software - a more capable text editor:
EditPad Lite / EditPad Pro
“https://www.editpadlite.com/”
For Mac OS users:
BBEdit at Barebones Software:
Linux OS - users might use EditPad Lite via WINE: