Getting this in 2.4.3
SELECT ST_AsText(ST_Transform(ST_SetSRID(ST_GeomFromText('POINT(-13279706.1692 5957543.84253624)'), 900913), 4326));
ST_AsText
-------------------------------------------
POINT(-119.293630204087 47.0946914247282)
(1 row)
And this in 3.0.2
SELECT ST_AsText(ST_Transform(ST_SetSRID(ST_GeomFromText('POINT(-13279706.1692 5957543.84253624)'), 900913), 4326));
-------------------------------------------
POINT(-119.293630204087 47.2862076625893)
(1 row)
I've confirmed that the definitions for both 900913 and 4326 are identical in spatial_ref_sys. Not sure how to even go about troubleshooting this...