I recently came with a rule that in a contest when there are multiple submissions then last pretest passed submission will be used for system testing and previous submissions are skipped.

In Codeforces Round 926 (Div 2), I submitted 1st question under 2 minutes and got pretests passed (Submission id-246491221) and i accidentally submitted similar code again after almost 1 hr 50 minutes (Submission id-246561262) and as per rule my 1st submission skipped system testing and 2nd submission got accepted which made my score drop and my rank drop from nearly 3300 rank to 5330 rank which will affect my rating.

I wanted to request that there should be some feature to lock any submission you want and not just last pretest passed submission as it is just taking penalties/lower scores without any reason. And also, if no submission is locked then next submission should only be tested if previous submission failed system testing which is done in some of the contests.