I didn't hear that one, the story I got was similar to this one...
The 47th Mechanized Brigade is one of the Ukrainian army’s best brigades. But being best isn't good enough when adjacent brigades just disappear from the front line.
www.forbes.com
Although I was under the impression that it was the 100th mechanised brigade (which is a National Guard unit that has been upgraded but still lacks its vehicle component) that had to assist the 47th in plugging the gap they left, I still believe the mistake was the 47th for leaving positions without the replacement unit being in place, I accept they are tired but there is a procedure to follow.