I was working on a report with my colleagues the other day and we were editing the code behid a custom column step in the Query Editor. When we clicked on the gear to edit the step, it looked as though there was no formula at all, but once we used the cursor to highlight the text, we realized power bi had made it invisible. It seemed to still work ok, exept that we could not delete the invisible text in the m code editor and, therefore, could not change the formula.
I have a screen recording of the incident, but there doesnt seem to be a way to post it here.
on:
URL is not filtering on field parameter