Originally Posted by
conoblep
Looks like a case of premature eCAPSulation (*queue eye rolls and groans from the unappreciative audience*)
It happens, with age.
It's worth noting that the failed CAPS canister was a re-pack, not a factory original issue. I think they sit on something like a 12 year repack cycle.
No idea why it failed, but from the appearance, it looks like a packing pin may have been left in place; total pack closure.