Change 199164 had a related patch set uploaded (by Subramanya Sastry):
T93369: Propagate null values without updating them

https://gerrit.wikimedia.org/r/199164

Change 199164 merged by jenkins-bot:
T93369: Nulls in DSR computation should not be coerced to 0

https://gerrit.wikimedia.org/r/199164

We had a HUGE reduction in warnings from that one fix.

But, we still have a few left. Try: http://localhost:8000/fawiki/%D8%A7%D8%B3%E2%80%8C%D8%A7%D9%85_%DB%8C%D9%88-%DB%B1%DB%B3%DB%B7?oldid=11515858

In T93369#1150560, @ssastry wrote:

We had a HUGE reduction in warnings from that one fix.

But, we still have a few left. Try: http://localhost:8000/fawiki/%D8%A7%D8%B3%E2%80%8C%D8%A7%D9%85_%DB%8C%D9%88-%DB%B1%DB%B3%DB%B7?oldid=11515858

Looking at parsoid output and php parser output https://fa.wikipedia.org/wiki/%D8%A7%D8%B3%E2%80%8C%D8%A7%D9%85_%DB%8C%D9%88-%DB%B1%DB%B3%DB%B7?oldid=11515858 it looks like bad wikitext leading to fostered content which is probably screwing up dsr computation. But, worth investigating to see if we can tweak the DSR algo in some fashion to handle that. But, low priority.