That dark stripe doesn't look right. I found similar ones early Sept. The closest I could find was Eucampyla etheiella https://bold-au.hobern.net/specimen.php?processid=ANICR1713-11 but the location didn't fit.
I expect the dark stripe is variable. Meanwhile E. ethiella is shown on BOLD as present on extreme east and west coast of Oz, so it appears to occur Australia wide ! But the BOLD specimens show no yellow coloring. Not impressed.
I too have wondered if it is Homoeosoma vagella or not. I think it must be. Several specimens on BOLD have very similar dark mark with brown mark above https://bold-au.hobern.net/specimens.php?taxid=362793 https://bold-au.hobern.net/specimen.php?processid=NSWLP935-13