Unexpected behavior: When entering insert mode in the vim editor, the caret changes to indicate insert mode (so far so good). If you then type at least 1 character, the caret incorrectly reverts back to its original state indicating the default mode. T

Expected behavior: The caret indicates insert mode until insert mode is exited.

Notes: in some vim implementations, for example the cli vim, the caret doesn't change. Instead, vim's command output indicates that the user is in insert mode by outputting something such as "-- INSERT --"