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These were covering a small Dodonaea viscosa shrub. At first I thought perhaps some sort of parasitising wasp, but I gently opened a few unhatched ones and it appears to have 2 wings.

I've shared it on a few insect related Fb groups and had various possibilities suggested inc. parasitising wasp, Scale and Psylloids. I don't think it is the latter as the adult is wrong.

Measurement is mm.

the nest is from a Delta bicinctum, and all the other chambers hatched successfully except for this one. This morning I noticed the head of this insect coming out of the failed chamber. Could it be that one of the grubs that was put into the chamber was already parasitised by a different species?

A Wasp - not European as I first thought - predating on a Damsel Fly.
The Wasp was flying around grasping the prey (image #3). When it landed, it appeared to be either probing/attacking or perhaps getting a better grip.
See also - https://inaturalist.ala.org.au/observations/146936298