IFMAR Rules are clear.
On carpet, the best two times from six rounds will be added together to determine qualifying positions. On tarmac, it is round by round with scores from each round added together. The best three scores from six rounds will count.
I guess that the scoring system will not give the TQ until all rounds are complete and they can find the best two scores. Unless of course they have decided to change to a rocket-round system at an International Jury meeting on Saturday, and we don't know... HTH