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Nymph
Found an adult and older nymph in exactly the same location when visited two days later. (See observations https://inaturalist.ala.org.au/observations/205070230 and https://inaturalist.ala.org.au/observations/205070235)
glendawalter uploaded an interesting sequence which shows an early instar (photo6) which has similarities to this one. https://inaturalist.ala.org.au/observations/40949531

Image 1: dorsum (green colour at posterior is an optical aberration, all else is fine); stereomicroscopy
Image 2: ventrum; stereomicroscopy
Image 3: host plant (Bursaria spinosa); photography

3 x nymphs collected in 80% ethanol.

Image 1: nymph ex situ; dorsum (L), ventrum (R); stacked stereomicroscopy
Image 2: nymph in situ, on leaf; photography
Image 3: host plant (Bursaria spinosa); photography

1 x nymph collected for rearing. Died on day 2–5 post-collection and placed in 80% ethanol.

Image 1: imago dorsum (L) & ventrum (R); stacked stereomicroscopy
Image 2: host plant (Bursaria spinosa); photography

2 x imagines collected live for rearing. 1 x imago died 1 day post-collection, so imaged and placed in 80% ethanol. Remaining imago died 7 days post-collection and placed in same vial of ethanol.

Spread out on thin branches of Bursaria spinosa, shared with Monteithiella humeralis. Twitches upon approach and may rotate around branch to avoid being seen. May drop when touched, and if so, it will then fall on the ground and walk, fall on the ground and briefly feign death, or fly. Odour not obvious.

Image 1: 14 x ovae, suspected Monteithiella humeralis or other Pentatominae sp., both of which were found on same bush; stacked stereomicroscopy
Image 2: host plant (Bursaria spinosa); photography

Collected for rearing but never hatched.