Unable to answer "This shop has been vacant. What’s here now?" – Parkville – node/246007454 via StreetComplete 60.3:

It's a private house

"Place has changed address to 18a market road, have added a new entry there"
The place has gone or never existed. A user of Organic Maps application has reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2025-02-27T10:33:49Z
POI name: Café Sunshine & Salamatea
POI types: amenity-restaurant
#organicmaps android

Where is the public_transport=platform (bus stop) for public_transport=stop_position node/11943548004?

"Roundabout newly constructed here"
OSM snapshot date: 2025-02-27T10:33:49Z
POI name: Talbot Street South
POI types: psurface-paved_good highway-residential
#organicmaps android

Gate

#OsmAnd

Gate

#OsmAnd

Unable to answer "Does this crossing have an island?" – Unmarked Crossing – node/12156891466 via StreetComplete 60.3:

No crossing here

Attached photo(s):
https://streetcomplete.app/p/269193.jpg

Unable to answer "Are there traffic signals that show when to cross here?" – Crossing – node/12174088874 via StreetComplete 60.3:

Path along the south side of the road here does not require traffic signals to cross the intersection due to the stub of road being closed off to motor vehicles.