[basex-talk] bug in processing XPATH with this simple regular expression?

Take this input: <div id="ps-content">foobar</div> and apply this XPATH 2+: //div[matches(@id,"^s-content$")] In BaseX command-line it matched! despite the fact that "^" in regex language means "the start of the string". With Saxon and Xidel command-line it correctly doesn't match. Why does it match in BaseX?