I just contacted "support".
Firstly, they have a systemic support problem in that they do not try to reproduce problems reported to them. Will not even consider it. If they were able to do that - or even if they were able to write-up the report for their software teams with those instructions - then they could investigate the problem as it happens. Far simpler and more valuable to them, IMHO.
Instead, they want me to run a tool called GetSystemInfo that produces a large ZIP file containing tons of information about my PC. When I looked into the file, I wasn't able to verify that it didn't contain any sensitive information. (I am a one-man consulting business, and my clients require that I sign NDA's to protect their IP. If any protected information gets slurped up by such a tool, I could be in legal jeopardy. Clearly, there's a level of trust we need to have in AV software, given the level of access that it has, but if I can't tell what's in the huge amount of information it has collected, I'm going to have to play it safe.) So I told them that I wasn't sending the GetSystemInfo output to them. Their response was to ask if they could access my system remotely and run the diagnostics themselves. Hmmm...
Given all of the apparent different tech. support conversations that people on this thread have had with Kaspersky about this issue, I'm amazed that no-one (I was in contact via chat with 2 of their support people) at their end is apparently able to do a search and discover that this was a known issue. It would have been great if they could say: "Yes, this is a known issue and we're working on it." I suspect that their systemic support issues (addressing the symptoms, not the cause) are ensuring that this is not recognized as an issue, and that no-one at Kaspersky is even aware of it, let alone working on it.
So, have to agree that I'm not impressed at all with Kaspersky's "tech" support.
I don't want to have to go back to V18 of the software, but that might well be the simplest option. It's annoying because I use the Ubuntu bash environment a lot and I find it ironic that I cannot install security updates for it because my AV software will not allow it to do so. :-(