I had my ejector replaced by S&W. The original ejector was the same thickness front to back and somewhat "springing".
The new ejector is 2X as thick at the base and tapers to the original thickness near the top. It is rock solid. Not sure if this is a general upgrade to new rifles or just a replacement change. Attached is a picture.
Update: Position, I notice it is "1/2 whisker" away from the bolt in both directions. Really just enough to clear. Anyone with Failure to eject issues, should reposition their ejector.
Has anyone else seen this ejector variation?
UPDATE:
It seems from the few comments that this design is common, although the original ejector in my 15-22 was as described above.