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Assuming the links have been removed completely, then not really. It can take anywhere from hours to months before Google will "react" to those links having been removed. If you're still seeing those links as valid in something like Open Site Explorer then don't forget these tools use their own methods for producing this list so it doesn't necessarily mean Google is still seeing the links. About the only thing I can suggest is if subdomain a is still up and running without the redirect, submit it to index via Search Console; anecdotally, this really does seem to promote it being re-indexed faster so theoretically the removal of those 301s may be picked up faster if they haven't been already. This can be found under Crawl > Fetch as Google.

Moreover, we have seen up to a 3 week lag between the time at which Google crawls a page to discover a dropped link and then actually removes that link from GSC data. So, basically it works like this... 1. You remove link from page... 2. Google re-crawls page... (can take hours to months depending on frequency of re-indexing by Google) 3. Googel removes link from Google Search Console (can take days to 3 weeks)

This sounds like a trust factor to me. When you search for a query and another very similar query is very common in the search data, Google suggest the common query instead of your exact query. I am not sure what kind of domain you are fighting for but if you get more links or somehow you can manage people to search your brand more, I think this can be eliminated. I guess!

Hi there, has your question been answered or not? Please let us know, thanks! ~ Christy