Imperial Moth caterpillar question

This is the first time I've had Imperials in over 30 years so I have forgotten everything I knew about their habits (except: don't try to change their food).

I already have 6 pupas burrowed in buckets of dirt. Caterpillars #7 and #8 are causing me some worry. They are both just sitting halfway in the dirt, hind end first. I have no idea whether the others went in head first or butt first but I do know they didn't sit half way in for half a day. The dirt is not compacted so they shouldn't be having problems with the dirt being too hard.

Anybody know whether this is at least semi-normal or do I need to be doing something to help them out.


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