The orig ejectors, they have an integral spring made as part of the ejector itself as already pointed out.
That spring has been known to break off. That leaves the part with no tension to move into the raceway as the bolt is opened. Thus there is little or no contact with the case that is being carried rearward by the bolt. No ejection is the result.
The breakage point is the sharp corner left from mfg'r on the originals where the integral spring met the ejector part itself.
When surplus rifles were inexpensive and sporters were made often on these (1917 rifle and the P'14 edition as well) the 'broken ejector' was a not an uncommon problem.
Numrich Arms and likely others sold an aftermarket ejector at one time. The new part had/has it's own separate spring design in the part.
That design seems to have given way to a new repro that follows the orig design w/it's integral spring.
However the new mfg has eliminated the stress point where they often broke by simply making that inside corner a radius instead of the old sharp edge corner.
Same integral leaf spring ,,just a small design & mfg'rg change
New design repro's are about $20each now.
.. with Numrich's lavish shipping costs it may be near double that!
A field expedient repair to one w/ a broken spring was to place a piece of rubber mtr'l behind the ejector when reinstalling it.
The rubber compresses and then expands when the bolt is opened and pulled to the rear to push the ejector blade out into position so it can kick the casing out of the recv'r.
I've read that a small piece of a tire was sometimes used to do the trick. Maybe that's just urban/jungle legend talk too.
It probably wouldn't give the ejector the movement the real spring arm did. But it may be better than just a broken ejector blade (spring).
I've never come across one with such a repair, but I have seen a few with the broken spring on the part.