Clean VVV
Latest Theme: Twenty SeventeenVersion: 1.7
No other plugins
Liveblog: Version 1.8.2
WP: 4.9.7

Tested also in original project where this behaviour was spotted.

See recording:
https://www.dropbox.com/s/gz2ypf08z5scbab/liveblog-missing-ul-in-liveblog-entry-clean-VVV.mp4?dl=0

Edit: Adding the video so it's not lost to time: