private var maximumDistanceForTrailingHandle: CGFloat {
    get async {
        return ...
    }
}

(lldb) po maximumDistanceForTrailingHandle
warning: :11:7: initialization of variable '$__lldb_error_result' was never used; consider replacing with assignment to '_' or removing it
  var $__lldb_error_result = __lldb_tmp_error
  ~~~~^~~~~~~~~~~~~~~~~~~~
  _
error: :8:1: 'async' property access in a function that does not support concurrency
maximumDistanceForTrailingHandle
^
note: :4:14: add 'async' to function '$__lldb_user_expr_12' to make it asynchronous
  final func $__lldb_user_expr_12(_ $__lldb_arg : UnsafeMutablePointer) {
             ^
                                                                             async

How to properly print async properties in xcode in lldb?