We had a misconfigured validation of a wildcard route which returned 200 for every route. This causes an increasing of 404 errors in Google Search Console for unknown routes of the following schema:
/jclipdllf.html /wjbcmlodxazxg.html /uamahtizftvppsqe.html
We can exclude a misconfiguration of the application which generates the these kind of routes. We do not generate any routes with .html ending. I know that it doesn't impact our rankings but I'm really interested in the cause of these urls.
Does it come from external linking ? But why and how ? Does anybody have seen such issue?