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Yes, they do appear slightly different to the kind of bridge 'bubbles' normally seen. However, if they can be penetrated to leave a noticeable gap between them and the cured fabric, it would seem to indicate air entrapment. Not certain on the part size or speed of infusion, but if there had been a small leak during the cure time, I'd expect to see some evidence in the flow media. Hopefully you can make a small hole in the middle and drip some infusion resin into them to fill the gaps. A tiny hole at either end helps evacuate the air and let the resin fill the space better.
The only other thing I can think of is, perhaps, the spray tack. I only use Aerofix 3, as it'd generally very reliable and leaves no trace but it does contain acetone. I've noticed, very occasionally, that there's been some slight de-lamination between the in-mould coating and the epoxy underneath, but it's only been apparent on trimmed edges. I've put this down to using a little too much of the spray in certain areas, as it's clear that something has affected the bond between the coating and the epoxy.
I'm quite careful only to use just a mist of it if that is all that's needed, but I've never seen anything similar on corners etc. where I might use a little more to hold the fabric. If your bubbles appear very shallow and not air-related, however, then perhaps it might just have something to do with the spray tack affecting the bond?
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