This is long winded so please bare with me. I have an official press guide and in there it states as follows
After the completion of heat 20
When establishing the order between the riders in the list of intermediate classification at the conclusion of heat 20 and for the purpose of deciding riders qualification for the semi finals, ties will be solved as follows:
a. Precedence will be given to the riders (tied on race points) having the most number of 1st, 2nd, 3rd or 4th placings (a"0" for last placing is better than being disqualified for whatever reason.)
b. If the tie still persists & involves only 2 riders, precedence will be given to the better placed rider in the heat where the 2 riders met.
c. If the tie still persists and involves more than 2 riders, it shall be checked whether there is a possibility to determine a proper precedence (e.g. 3 riders tied on points: A, B, C:
rider A has beaten rider B
rider A has beaten rider C
Rider B has beaten rider C
Then the precedence will be: best position for rider A, then rider B and then rider C.
d. If solutions a, b and c cannot resolve the tie, then the lowest riding number jacket will be deemed the better placed rider.
Apologies if you already read this elsewhere.