It's not a bug, it's a feature that was made like that from the start. Link1 , Link2 , Link3. It also a known issue that you can't deduplicate sorted\filtered table. Just not a thing. Deal with it.

No, I have not. I did my share of reporting bugs and requesting features in OSS, but assholes like dude below will never be happy about me, cause how dare I to call out on obvious flaw in open software! OSS doesn't have issues, YOU LYING! I'm done. Kinda burned out. OSS community sucks and can go fuck itself.