Ok, thank you for the explanation. I see the description on the wiki. But notice that it is marked 'dubious', thus I think no mass edits should be made based on it. Also, notice the reasoning for it is that routers should pass at least a small segment of the roundabout so that they even notice it (and can speak it out ("enter roundabout")). But I assume that is for cases where you can enter with one of the branching roads and then exit immediatelly with the next. But that is not the case here, you cannot exit the roundabout via the Napervillska street (there was a turn restriction relation present). You must go via the rounandabout and exit at the Chrenovska street at the soonest. Thus, the router will pass over a segment of the roundabout in all cases, whether you add the small segment you created or not.

So either you revert this changeset as it is not needed to solve anything, or fix all the bus lines, but that will be very tedious and costly for no benefit. Just don't have an invalid middle-ground with broken bus relations.
Thank you.