Some geometries don't work with ST_Union and gives a non-noded intersection

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I'm getting a lot of errors like this:

GEOSUnaryUnion: TopologyException: found non-noded intersection between LINESTRING (147.254 -42.8705, 147.254 -42.8705) and LINESTRING (147.254 -42.8705, 147.254 -42.8705) at 147.25355728849621 -42.870521684000678I am calling ST_MakeValid(ST_Union(ST_SnapToGrid(mpoly))) on an aggregate of all rows that match my filter.



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