Unable to answer "Is there tactile paving on this curb here?" – node/13152286372 via StreetComplete 63.1:

No curb, sidewalk is continuous but lower. Same for the next intersect westward.

Unable to answer "Does this crossing have markings across the roadway?" – Crossing – node/13859965297 via StreetComplete 63.1:

There's no crossing per se: the sidewalk is continuous east-west and simply slightly lower such that cars can turn north. Same for the next "crossing" a few meters westwards.

Unable to answer "How many car lanes does this road have?" – Boulevard Dubouchage (Residential Road) – way/797535877 via StreetComplete 62.0:

The actual lanes are somewhat different from the map: a one-street from the North, which turns either left or right immediately, without having to cross the subdivision of the Dubouchage Blvd that goes into the tunnel.

Attached photo(s):
https://streetcomplete.app/p/317662.jpg

Unable to answer "What’s the height of the curbs at this crossing?" – Marked Crossing – node/303404329 via StreetComplete 62.0:

No crossing there, the actual crossing is a few meters Eastward (already mapped)

Unable to answer "Do these steps have a ramp? What kind?" – Steps – way/243900473 via StreetComplete 61.3:

Wrongly tagged as stairs: it's similar to every other pathway of the garden, with a few steps at the very end (north west)

This inner road path is wrong: it does not exit onto the promenade but continues straight until Rue Lenval.

via StreetComplete 62.1

Unable to answer "Which direction leads upwards here?" – Ruelle Saint-Martin (Steps) – way/28510535 via StreetComplete 61.3:

There are no steps on this segment, it's a normal, narrow (~1.5m wide) street.

In context of overlay "Places" – Pharmacie l'APOTHEQK du Square Goiran (Pharmacy Counter) – node/5076307662 via StreetComplete 61.3:

Can be removed (duplicated with the one nearby)

Unable to answer "What’s the height of the curbs at this crossing?" – Marked Crossing – node/7501702316 via StreetComplete 61.3:

No crossing there

Unable to answer "What can be left here for recycling?" – Recycling Bin – node/7555028076 via StreetComplete 61.3:

No longer exists and the garden has been extended