Quick question about Daily Mission count

I don’t know if this is true or not because I read it a loooong time ago but: If someone was unable to complete daily missions the number of daily missions for the next day would decrease?

Because if that was the case I’ve got proof that it doesn’t happen, I’ve finally been able to access my achievements tab after well over a year due to crashes, and the daily mission count is still at 9.

Ultimately I don’t really care but was just wondering if the above was actually true.