Did anybody get resolution to this. I came across similar issue. after scratching my heading into debugging for few days, figured out issue only happens when you upgrade the UiPath.IntelligentOCR.Activities and UiPath.DocumentUnderstanding.ML.Activities the latest version. Older version which comes as part of the learning zip file works fine. is this a bug ?
One thing as per compatibility after 6.19 package of intelligent ocr separate instalation is not needed for ml package it gets auto installed so try to remove both and add only intelligent icr latest and then you need to upgrade ui automation and ocr if you have