Just had the same bugs ruin our attempts at CoE.
First we tried to do path 2 but the door wouldn’t open after the first Subject Alpha encounter, so two of our group quit. We spent ages finding replacements and went back in to try path 1 instead. We got to Bjarl and he just wouldn’t knock himself out on the pillars so he was permanently unkillable. In fact, half the time he was just standing still doing nothing, or doing his charge animation but not actually moving anywhere, so we had to give up and leave.
Not happy.