[basex-talk] Unexpected result with simple mapping operator and sequence of maps

Hi, BaseX folks. In BaseX 12.1, Query A below returns (false, false), but I expected (true, false). Query B returns true, as I expected. Query C returns (true, false) as expected. Query A let $map1 := map{'key1': 'string'} let $map2 := map{'key1': [] } return ($map1, $map2) ! (. instance of map(xs:string, xs:anyAtomicType) ) Query B let $map1 := map{'key1': 'string'} return $map1 ! (. instance of map(xs:string, xs:anyAtomicType) ) Query C let $map1 := map{'key1': 'string'} return ($map1, 0) ! (. instance of map(xs:string, xs:anyAtomicType) ) Am I missing something, or is the Query A behavior a bug? Thanks, Amanda