I'm assuming the EC was doing the LPS with his own forces.
Nearly every GC I bid to has their estimating assistant call me prior to bid time and go over EVERY section of the specs to confirm scope.
This would have never been missed by the GC....in fact, I find it hard to believe the EC would have missed such a common requirement.
I also find it hard to believe this, and all of the other things you mentioned weren't flushed out during pre-award interviews.
...but that's just me
and *that* really brings us to the nut of the issue here,
both with the OP's concern, and subsequent comments:
vetting general contractors.
bidding work with a general contractor who is not competent
enough to define job scope with their subs is also not competent
enough to define job scope with their customer.
and that means, there are two ways the project can go south.
and both of them will adversely affect the sub.
with reference to some of the comments made here, anyone
who will bid and undertake work with someone who proceeds
with as little due diligence as has been displayed here in some
of the remarks deserves what will eventually befall them.
and i don't give a damn what state you contract in. it's easy enough
to lose money almost anywhere.
and a GC who thinks that doing the work of the bid AFTER the bid is
over simply means he didn't do his job.