In the years since the American Rifleman article there have been tens of thousands of rounds fired in all sorts of rifles with all sorts of brass.

The only bananas that were found came out of a Lee-Enfield brand banana maker.
No other brands of banana makers have be found. Even the tilting bolt Hakim does not produce bananas in spite of the fact that it's bolt must tilt up and down to lock and unlock.
The same brass that some attribute the problem to can be reformed to other round such as the 6.5X53R Dutch Mannlicher and reloaded many times without case head separations or bananas resulting.