When I place the cursor before the template output, and press "Delete", it deletes the template and one more character after the template. When I place the cursor after the template output and press "Backspace", it does not delete the template (simply does nothing).
Version: unspecified
Severity: normal
Confirmed.
Trivial test case: Start with an article with an inline alien - e.g. "ABC<tt>:-)</tt>DEF". Place the cursor immediately after C, and press (forwards) delete; instead of just deleting the alien, it also deletes D.
Undo; place cursor immediately before D (just after the alien), and press backspace; instead of deleting the alien, it does nothing.
Confirmed in Firefox.