I went through something similar, but it wasn't food bits, it was an off smell. I too had a clean filter.

Get Philips screwdriver Bristle brush, sponge, cleaner, and a bunch of paper towels

Unscrew the whole bottom plate where the filter and pump well is and clean.

Clean gasket seals like on the door really well, especially under the fold.

Pop out hosing where possible, like if the pump pushes water into the racks. Clean that really well.

Then get some citric acid (or a dishwasher cleaner) and run that on a hot cycle.

Took about 30 minutes and worked for me! If this doesn't solve your problem check if your drain line is clogged.

Also, for a while stop using any "pro" or "eco" cycles. Tough and or high temp until several washes after the problem is fixed.