Would not have thought about it. But, Before I moved to California I had a portable dishwasher in my east coast CO-OP. Then when I moved here I rented a cheap (at least here cheap) apartment. No dishwasher Now after several years I bought a condo with a real dishwasher.
So after living here about six months, I decided to make sure the dishwasher was operating correctly. Well I took the top of the the air gap (for the drain). Oh my several test strips logged inside. Definitely drains better now.
I would have never thought to check for test strips. Although they seem to be all over the condo (LOL)
T2 test 5 times a day. So just my thought check out your drain for your dishwasher.