…and by the point that you see them, your extract is too viscous to filter them out or even make a decent attempt at isolating them? woof.
I got nothing. except that you changed growers. and growers put all sorts of weird stuff on their plants.
if it doesn’t redissolve upon heating, you might be able to decant most of the upper layer off when warm, then pour the lower layer enriched in WTF into a test tube (or like shaped) to get a decent “pure” sample of the mystery chunks.
if the first decant isn’t good enough, you might be able to repeat it a couple of times and improve “purity”.
then ask:
is it water soluble?
Is it ethanol soluble?
How about @Beaker’s multi-solvent array?
post the results. page a resident chemist or three.
that might not tell you what it is, but it will probably help inform removal.
having captured some, you can also try submitting it to a 3rd party lab, but you’ll want to discuss the problem with them up front…if it is something your new grower sprayed on there, it might be something they’re used to seeing, but more likely it’s outside the scope of their day to day analyses (so a non-cannabis lab might not be a bad idea).
Edit: or maybe you got lucky and @Soxhlet nailed it with “filter aid”.