As I mentioned earlier, our mapping process is designed to add turn:lanes tags to the segment closest to the intersection, mostly one segment, not all segments closest to the intersection. In this case we did not modify the lane tags for the westernmost way, that's why it hasn't been split. We have modified the lanes tags only for the easternmost road and these edits have been done correctly.
In other words, we did not add incorrect information, nor did we change correct data to incorrect. Instead, we simply added a piece of useful and accurate information to the OSM for this particular part of the road (from osm.org/node/1518000019 to osm.org/node/13120657642).

Best regards,
Yuliya
