Hello, 

First of all, I am sorry for the mistake.

I've narrowed it down to a mistake in the nsi, which ID uses to suggest tags.

https://github.com/osmlab/name-suggestion-index/blob/af8189f43e1fbda6c57fa41d25405edba604b790/data/transit/route/subway.json#L752

I believe that "Московский метрополитен" could be the correct tag.  Can you confirm this for me? 

When the fix is implemented, it will take a few weeks for this to get implemented in ID, and till that time, you will get false positives.

- wvdp