Blockyness in Samurai Shodown Anthology

[themanuel]

2D character graphics in this game show an artifact where the body seems divided in large blocks as seen in the picture.  It is more as if the region where the character is displayed is divided in quadrants and the body passes through those sectors.

I've tried deactivating every graphic setting I could think of, running at native resolution, and multiple back-ends, but the result is always the same.

Is there a solution to this?

https://imgur.com/PDCerdQ