Hi Cyrille37,
I need to share my information with you about the "proposed tag."
When using a tag "proposed=primary" it must be used with highway=proposed.
But when used  "highway=track" Added only without the proposed tag,
because the tag "proposed" can be used for any feature that is still in the planning phase, but construction hasn't yet started
But "highway=track" is used for minor land-access roads that are not considered part of the general-purpose road network
You can see this Page
https://wiki.openstreetmap.org/wiki/Key:proposed
If you have different information, please share with me or fix this issue
https://www.openstreetmap.org/way/1388446223
Best regards,
nona mostafa