Thanks for testing this – I think we’re getting closer to the problem here!
The get_compare_questions is get_questions from recipes.compare. It’s true that this function removes the previously set hashes – and if no hashes are set on the stream, the controller will set them using util.set_hashes with the default settings (for comparison tasks like this, this means, the hash is based on the 'input' property).
Is it possible that two tasks in the batch have an identical input? And does setting hashes on the stream manually make a difference, e.g.:
stream = list(get_compare_questions(before_stream, after_stream, True))
def set_hashes_on_stream(stream):
for i, task in enumerate(stream):
task['_task_hash'] = i # not so elegant, but whatever
stream = set_hashes_on_stream(stream)
I’ll also keep investigating this and will try to reproduce the error! While the unique identifiers are a likely explanation, it could also be that something else is wrong, or there’s indeed some bug on the front-end. (I’m looking forward to using a proper JSON schema for the task validation, as described here – this will hopefully make it easier to catch specific task formatting problems and show better warnings and errors in the app.)