Spread footing design according to AASHTO 10.6.1.3 with multi column pier

Hi, 

I am designing a multi column pier on spread footing in LEAP 20.00.00.58. I noticed that the option in A/D parameters of designing footing per AASHTO 10.6.1.3 disappears once multiple columns are specified in the model.  Is this a bug, since 10.6.1.3 and 10.6.1.4 do not say that they are not applicable to multi column piers? I assume the analysis would be conducted such 10.6.1.3 is not considered?

When there is only column specified, option for 10.6.1.3 exists 

When there are multiple columns specified (two in my test case), option for 10.6.1.3 does NOT exist