I'm the match director of our Club's military rifle and pistol matches, and having owned a number of CZ 75 and 85 series pistols, if I saw your gun do this during a match I would have you clear the pistol and remove it from competition as a defective firearm. If someone can show me in a CZ Owners Manual where the gun is supposed to do this as a matter of normal operation, then I'll relent.
Once upon a time I had a pistol that had a tendency to lock the slide open prematurely.
There was nothing inherently unsafe about this, and the only way that I found out that my gun had a tendency to do this action that wasn't detailed in the manual was via shooting competitively.
Lo and behold, at a local [action pistol match that wasn't USPSA], the gun locked open part way through a stage. Thinking the gun was empty, I dumped the magazine and inserted a fresh one.
After completing the course of fire, the RO told me he was assessing me a penalty for failing to retain a partially filled magazine. I related what happened, that the magazine was dumped as a result of a malfunction. His response was "you can either take the penalty or I can give you a match DQ for using an unsafe weapon."
Now, there is nothing inherently unsafe about what my gun did.
Nor is there anything inherently unsafe in the function of the OP's handgun. In fact, many handguns will drop the slide if the magazine is forcefully inserted.
Threatening someone with a DQ because their gun does something that isn't directly mentioned in the manual, but is consistent with the laws of physics is, frankly, a phenomenal way to drive people away from the sport. Point of fact, the match I participated in where I was threatened with a DQ was one of the last times I opted to compete at one of these [action pistol matches that isn't USPSA.]
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