The ST_PointFromWKB() function ignores the SRID parameter and returns 0 regardless of specified SRID parameter.

To reproduce this behavior:

SELECT ST_SRID(ST_PointFromWKB(POINT(1,2), 4326));

Should return 4326, but returns 0.

If creating the point from Well Known Text instead, the SRID is preserved (expected behavior)

SELECT ST_SRID(ST_PointFromText('POINT(1 2)', 4326))

Returns 4326 as expected.