Not sure if i can get a picture as I would have to be super quick to capture it, but I am in sector 70 and a few times while I am retreating enemies will spawn and kill me again while I am already retreating. Not sure if this happens in other sectors but it has happened multiple times in sector 70 from what I have noticed. Not a huge bug but thought I would bring it up.
#Enemies spawn while retreating
green drum
quartz talon
happens in the 20's. I'm not sure if it's a bug or not but I figured I'd add to your inquiry.