UnnestScan with explicit Unnest returns wrong results

UPSERT INTO default values("k001",{"arr":[{"x":1}, {"x":2}, {"x":1}, {"x":1}]});

CREATE INDEX aix1 ON default(ALL ARRAY u.x FOR u IN arr END);

CREATE INDEX aix1e ON default(ALL ARRAY u.x FOR u IN arr END, arr);

SELECT u.x

FROM default AS d USE INDEX (aix1)

UNNEST d.arr AS u

WHERE u.x > 0

ORDER BY u.x;

results

   [

    { "x": 1 },

    { "x": 1 },

    { "x": 1 },

    { "x": 2 }

   ]

SELECT u.x, d.c1

FROM default AS d USE INDEX (aix1)

UNNEST d.arr AS u

WHERE u.x > 0

ORDER BY u.x;

results

    [

    { "x": 1 },

    { "x": 2 },

    { "x": 1 },

    { "x": 1 }

    ]

SELECT u.x

FROM default AS d USE INDEX (aix1e)

UNNEST d.arr AS u

WHERE u.x > 0

ORDER BY u.x;

results

   [

    { "x": 1 },

    { "x": 1 },

    { "x": 1 },

    { "x": 1 }

   ]