Steps to reproduce:
I have seen this on a few random sites but mostly on BING (don't laugh)
Enter a search in the search bar and hit return, the search loads.
Now position the cursor at the beginning of the search term and start typing
The entered text should be prepended to the search term.
Instead, after the first character the cursor jumps to the end of the search term and additional text is entered there.
Version 0.99.107-beta (WebKit 613.1.3)
Mac OS 10.15.7