What happened was as it was an NBC/MSNBC simulcast NBC ran out an ad break midway through Morgan Chesky’s report. So MSNBC decided to end it and I guess she expected them to cut to the anchor on before her. She came out about five minutes before the report for MSNBC (likely because she’s much more known than the relatively new to MSNBC anchor). I assume at the end she expected them to cut to the anchor. But with everything being run on a skeleton shift they cut back to her who obviously was frustrated as it was cut off. She comeback to anchor the 11 PM and 12AM hours. Once my computer finishes transferring and encoding everything (a ton of video from the space launch) I will try to make a side by side video of the two broadcasts.
I watched the special report on MSNBC and I remembered after they went to commercial break after the special report, they had brought up Joshua Johnson from the previous hour to take over coverage. Chris Jansing was just on air on the channel for around 20 minutes.
I assume Chris Jansing was anchoring from home and the gallery (control room) had problems with connecting to Chris' talkback, hence you heard some kind of device (I think it's a landline phone?) besides her "beeping" at the start of the special report. So they just brought on Joshua again in Studio 3A...
The start of the special report I found on YouTube and her device "beeping" that I was talking about:
https://www.youtube.com/watch?v=2WTsrCg1qfE
She was coming from her home studio, later in the night she said something like “normally in New York you hear sirens of police, fire and EMS outside the windows behind me in my apartment”.
I imagine Chris was brought on solely for the special report, which is why she was on the air shortly before the report at 10PM. Normally they don’t hand over coverage in the middle of an hour unless it’s say the bottom of the hour. She took over at 9:55, no reason for Joshua Johnson not to finish out the hour if not for having Chris Jansing ready for the SR.