I'm on a limb here and guessing again.

But..I have seen rifles with so called feeding issues and in truth they had 'em, as you could not manipulate the bolt in any manner you chose or the problem would surface.

However, once you learned the "trick" (speed and feel) to running it, the problem disappeared.

Those lacking finesse had feeding issues, those that figured it out didn't.

Most of us can run any bolt and screw up it's feeding if we want to, I can also take some that may be tempermental and figure put how to make it operate.

Thinking that might be the case here.