Here is the thing: If this is fine then can you explain to me what "busway:left=designated" is supposed to mean? For starters, the only expected values for it are "lane", "opposite_lane" and "opposite", not "designated", that's an access value, and there is no wiki entry on what's supposed to be mean (not to mention that "busway" and variations have been deprecated for quite a while, the tagging should be changed to "bus:lanes=*").

If the lane is really disappearing, nothing is designated to a bus, making this tag misleading, if the lane is still existing, why "designated" and not "lane" like the other* piece further behind?

*https://www.openstreetmap.org/way/316681008