This "feature" was added in the Nov 18 beta:
Added a separate key binding, ctrl+e, to copy the selected text into the find panel. ctrl+shift+e will copy the selected text into the replacement string.
Problem is, I am very used to all my other editors automatically doing this with ctrl+f. It is in my muscle memory now, and that is difficult to reprogram. I constantly find myself searching for the wrong text now. Is this configurable in Application.sublime-options?
It is also not enough to just swap ctrl+f and ctrl+e since ctrl+e does not bring up the find panel unless something is highlighted, unlike ctrl+f.