Asobo team and Moderators are looking at that forum, so for sure your report will be seen. We know that a report has been sent to the dev team when it has been flagged, below the explanation of those flags. I would think that in order for your issue to be feedback-logged we should 1st identify a way to replicate it in all cases.
I am also wondering if your issue not the same as reported in the link I have provided in my previous post and this one is already feedback-logged. I have tried a flight number with a zero but it is saved without any issue. So for me it can happen whatever the number are, for the moment issue looks random.