GeoJSONResponseWriter produces multiple GeometryCollections

When this SpatialRecursivePrefixTreeFieldType

"GEOMETRYCOLLECTION (POINT (5.184892 52.043278), MULTILINESTRING ((5.12150188 52.0912345, 5.12151772 52.091203, 5.12158176 52.0912144), (5.12154184 52.0900637, 5.121529 52.090092)))"

is retrieved using the GeoJSONRepsonseWriter JSON is returned that included multiple GeometryCollections while only one GeometryCollection should have been created.

The output I get is
{"type":"GeometryCollection","geometries": [

{"type":"Point","coordinates":[5.184892,52.043278]}

,{"type":"GeometryCollection","geometries": [

{"type":"LineString","coordinates": [[5.121502,52.091234],[5.121518,52.091203],[5.121582,52.091214]]}

,

{"type":"LineString","coordinates": [[5.121542,52.090064],[5.121529,52.090092]]}

]}]}

The expected output would be

{"type":"GeometryCollection","geometries":[

{"type":"Point","coordinates":[5.184892,52.043278]}

,

{"type":"MultiLineString","coordinates":[[[5.12150188,52.0912345],[5.12151772,52.091203],[5.12158176,52.0912144]],[[5.12154184,52.0900637],[5.121529,52.090092]]]}

]}

or optionally

{"type":"GeometryCollection","geometries": [

{"type":"Point","coordinates":[5.184892,52.043278]}

,

{"type":"LineString","coordinates": [[5.121502,52.091234],[5.121518,52.091203],[5.121582,52.091214]]}

,

{"type":"LineString","coordinates": [[5.121542,52.090064],[5.121529,52.090092]]}

]}

The most recent GeoJSON spec states:

"To maximize interoperability, implementations SHOULD avoid nested
GeometryCollections. " (https://tools.ietf.org/html/rfc7946)