The video above demonstrates everything below. This bug lasts until you step back on the elevator after having gone up to view the cleaning bots.

Reproduction

1. Make sure you have a clone, this part is rather important.
   
2. Kill the last bot near a saw, preferably going away from where it stops so you have more time.
3. Step out in front of the saw in a way that you will likely die, you have one chance, two if you're lucky.
4. After death, do back up the elevator platform and observe.
5. Go back down to the upgrade room, once you go back up the next level will start.

Interesting Note

• If you perform this bug on a tier ending level when you go back up the sound effect will play and the tier text will display, as seen in the video.

Very nice finds! I'll file a report for these two bugs. Great video by the way :-)

-Cheers