Hello and welcome! I have no idea what has been happening in Sydney but some locations in the world have been experiencing a Pokémon GO rebalance to follow density rules for this game, which were previously not respected. I see a ton of Wayspots can still be found in Lightship around the piers you show in your screenshot, so this could be similar. The rebalance can take several days as in this example below.
(again I have no idea if this is the reason you are not seeing wayspots, or if you are experiencing some other glitch)