Interesting. Looks like the pin has pulled down through the aluminum
due to load. The bearing stress on aluminum
is quite low and in theory this can happen well below the break load of the shroud
on many masts, but it isn't common.
It almost looks like the pin is one size smaller than the hole was designed for.
Is the forestay toggle centred on the pin, or has it slid across to one side loading it up more? It's an unusual system and some more photos would be useful.
Prehaps drilling it out to take a larger pin would increase the bearing area and stop it happening again, otherwise doublers would need to be added, Ideally by welding or prehaps by bolting in place.