I don't know if 1049 aired, but I tuned back in just in time for the closing of 1050, and it was an unedited print with no trolley card and the NET logo ("the public television network" variant), which is consistent with Tim's recap. I guess 1047 truly must have been missing or not in good enough condition to air, though then again some other episodes have had tracking issues. I highly doubt it was a content-related ban, judging from the recap and the fact that it still aired into the '80s.