Prionotheca Weirdness...

So, when I originally received my Prionotheca coronata, I noticed the largest larvae was a bit sluggish, and it appeared to have just molted too. So I was a little concerned, but it burrowed down and seemed to be doing OK for a while, so I figured it had recovered fully from whatever stress it endured during shipping.
Unfortunately my doubts are back, and for good reason, this larva has now constructed some sort of cell at the bottom of its enclosure, and I'm not sure why.

Not only is this larva less than half the size mature larvae should be, but this cell does not look tall big enough for it to pupate in, so I don't know that it's a pupal cell. The larvae also doesn't look very plump either, still on the skinny side, so it shouldn't be pupating OR molting to the next larval instar at this point... (not that most Teneb larvae make these kinds of cells for just molting anyways). It's just lying at the bottom of this weird chamber, twitching it's legs and mouthparts, and I have no clue why...

My only two guess are A) the rise in temperature from being shipped in the heat of summer, while not directly fatal, has induced it to prematurely pupate, despite the fact that it's clearly not grown enough or fed enough to be doing so, and will likely die as a result...

Or B) It's actually an Asbolus larva, as the previous owner did keep Asbolus and Prionotheca together... However I've kept Asbolus larvae before, and they didn't look quite like these. Would explain why it's able to attempt pupation at this size though, if it were Asbolus it'd be nearly full grown.

Besides those two options, I'm not sure what could be going on... Either way, I'm thinking I only realistically have three healthy Prionotheca larvae to work with, not a great number, gonna have to get insanely lucky if I want to breed this species.