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my $o = bless { x => bless ['y'], 'My::Value' }, 'My::Class';

{ x => [$v], # where $v is 'y' or 'z'
  a => 'b' } # if a exists at all

cmp_deeply $o, noclass(subhashof({ a => 'b', x => subbagof('y', 'z') }
+));

#   Failed test at ...
# Comparing $data->{"x"} as a SubBag
# got    : My::Value=ARRAY(0x561fbd1fe3a8)
# expect : An array to use as a Bag

cmp_deeply { x => ['y'] },
           subhashof({ a => 'b', x => subbagof('y', 'z') });

use Test2::Tools::Compare qw{ like hash item field in_set DNE bag };

...
like $o, hash { field a => in_set(DNE(), 'b');
                field x => [ in_set('y', 'z') ];
         };