I believe something is broken there.
That being said, it might be just me using it incorrectly.
When testing the task, I can fill the blanks but INGInious considers that the question is not answered:
ERROR: Please answer to all the questions...
When having a quick look in the code, it seems to me the problem is from "adapt_input_for_backend" in init.py. Indeed match is always set to false which might be the issue there ?