i have checked all the gaps since beginning of 2015 on 30 minutes tf. There around 70-80 All has been filed without any exeption exept the last one that correspond at a price at 1.10800 on eurusd. The gap on eu at 1.08500 has been filed on dxy as you can see so for me its not available.
I tried to go further in the past before 2015 to check them all but i dont reach to see the candles if someone has the solution for that he is welcome.