It may be that a persistent gremlin, despite the tab, is due to an extreme difference in the mating of parts in a particular rifle. It could be that a locking block made in 1958 combined with a striker made in 1972 combined with a second generation Century disconnector combined with a weak recoil spring... etc, etc, etc, would create a mismatch on the far end of the bell curve. Reportedly, the VZ58 is designed with "a ton of slop" to mitigate potential problems with military refurbishing and differences of manufacture across regions and decades. Even that would have limits.
My VZ2008's have gone through thousands of rounds without any problems, and the first 1,000 rounds of each without a tab. The inside of the receivers are shiny with mating marks but everything still looks fine without undue wear. Who knows, a problem might surface if I'd start exchanging parts between the rifles, but I haven't had the need and would be hesitant anyway due to possible head space issues.
To say that 99% of VZ2008's are junk is either ignorance or hyperbole, both of which are correctable positions. Do a search for any variation of a VZ58 clone -- D-Technik, ORF, OOW, CZ-USA, CAI -- and you will find posts both lauding and cursing each one. Proportionally, there are far more praises for the VZ2008 than criticisms. Unless you've personally fired a hundred VZ2008's and only one of them worked well, you don't have an informed or legitimate opinion. Try typing in any firearm model, followed by the word "problems", and you'll find dozens and dozens of reports, whether it's Century or Ruger or Beretta or S&W or Glock or Remington... on and on.
