Welcome to OpenStreetMap.

I'm afraid that you may have misunderstood how crossings work in OpenStreetMap. The definition of a crossing in OSM is a bit broader than just a marked or signalised crossing like a zebra, pelican, puffin, toucan, parallel, or pegasus crossing. There's more information about how crossings are mapped on the wiki, linked below.

The crossings over Thomas More Street at its junction with East Smithfield have lowered kerbs, yellow blister tactile paving and a crossing island. The crossing over the service road/driveway for Tower Bridge Business Centre also has modified kerbs and tactile paving. These have been explicitly designed as pedestrian crossings.

https://wiki.openstreetmap.org/wiki/Tag:highway%3Dcrossing