https://www.arachne.org.au/01_cms/details.asp?ID=1827 and this reference shows a spider with an egg sack like yours https://australian.museum/learn/animals/spiders/hackled-orb-weavers/
the paler thing is the egg sack, the darker (horizontal) thing on left (1st picture) is the spider in resting position see also Sighting 4587011 & 4573224
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