"extent" field stores information like '0103000020430D000001000000050000009C43A5BC013D5EC15.............'
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What are the results when you add a GeometryReplacer and try the different Geometry Encodings?
Hopefully one of the encodings will do the trick...
Edit: Probably the encoding is OGC Well Known Binary.
Thanks, it worked out with OGC Well Known Binary encoding...