I disagree, there is no clear cut reason for a file being stuck, whatever you read here are only theories
I have no dependents and neither does my mother
I sent my birth certificate where it is clearly stated she is my mother (I even highlighted my name and her name), properly translated by a certified translator
In conclusion, our file does not fulfill any of your reasons and it was stuck on Application received until yesterday
Oh by the way,
@robertp you can update line 13, in process since July 18th, 2019