Can anyone help Id the black marks on my Hoya PLEASE

Auckland, New Zealand

Got home yesterday and did my usual rounds of my plants to discover one of my Hoyas (Australis) a little odd.
She has black spots/marks on a few of her leaves.
Much appreciated if someone can help identify what is wrong and how I can treat her. I havent had her long on inspection of her soil I found a couple of wee mushrooms and the soil feels compacted.
Thanks in advance (worried plant Mumma here)

I have isolated her from my other plants

This message was edited Jan 28, 2021 12:50 PM

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