Hi, Baloo Uriza
My name is Marina, and I am a mapper on the OSM team at Lyft. Thank you so much for paying attention to this. 
The OSM wiki has two approaches to tagging lanes count. We use both of them.
In this case, we use information from the article on the OSM wiki and added lanes=3: “If the number of lanes changes, it is necessary to split the OSM way. This should be done as soon as a new lane has started (regardless of width)...” (https://wiki.openstreetmap.org/wiki/Key:lanes#:~:text=for%20further%20details.-,If%20the%20number,-of%20lanes%20changes ).
According to another article in OSM Wiki (https://wiki.openstreetmap.org/wiki/Lanes#:~:text=is%20an%20intersection.-,Street,-Here%2C%20a%20residential ), only a fully formed turn lane can be included into the lane count (i.e. a turn lane transition area marked with dashes where the lane begins to form do not include into the lane count since it is not fully formed). 
In our opinion, these 2 articles contradict each other and become a source of confusion. We assume that both methods can be correct. If you know any other details that can clarify the current state of this area, we'll be happy to work on this further. Thank you so much for your contribution!
Best regards,
Marina
