Persistent Drainage Issue in Maytag Dishwasher Despite Repairs

I'm experiencing a recurring problem with my Maytag dishwasher, where it fails to drain properly at the beginning of the drying cycle. I've had a technician check it, and they confirmed that the drain isn't clogged, as the dishwasher successfully drains during a rinse cycle. Despite this, the dishwasher continues to display an error code related to the drainage. Initially, the technician replaced the chopper, thinking it might be the cause, but this didn’t solve the issue. Following a suggestion from Maytag, I then replaced the heating element, but unfortunately, the problem persists. The dishwasher still drains correctly during a rinse cycle, which adds to the confusion. At this point, I'm out of ideas on what to try next to fix the issue. Any insights or suggestions would be greatly appreciated.