odd split

I take it only one of the veneers has separated (from the pic atleast)

I've only seen that sort of splitting in lower quality veneers and in ply that's been left directly in sunlight in the storage store...... Where I get my ply from they have a 6mm sheet that's "sacrificed" to protect the ply sheets underneath, its full of fracture splits like the one you've pictured, the pack is stored under a laserlite sheet in the roof and the sunlight hits the rack around 11:00am through to late arvo baking the ply sheets to destruction. I always pull half a dozen odd sheets off before taking 'my sheets'