[PostGIS] #6010: ST_Polygon(rast) returns the box of the tile instead of multipolygons of only valued pixels.

[PostGIS]

#6010: ST_Polygon(rast) returns the box of the tile instead of multipolygons of
only valued pixels.
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  Reporter:              |      Owner:  robe
  GISuser5432            |
      Type:  defect      |     Status:  new
  Priority:  medium      |  Milestone:  PostGIS 3.6.1
 Component:  raster      |    Version:  3.6.x
Resolution:              |   Keywords:  ST_Polygon (raster) ; Raster;
                         |  PostGIS_Raster;
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Changes (by GISuser5432):

 * Attachment "ST_Polygon_Error.sql" added.

 The dump of the table with a single row to test.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6010>
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