Because Retrods are literally reskined Zombies (Both weak to elemental, have similar basic and "breath" attack with a face wiping animation) this memes any danger room or event that spawns only retrodes on a level will NOT spawn spikes. There are several floors where this happens to the point it's annoying and a determent to the grinder that is getting the new gun.
This issue is something I assume can be fixed easily but I don't know how much spaghetti is in the code at this point and just hope it's something that can be addressed soon.
IGN: Embron
Since I saw this post I have to admit that I also noticed that Retrodes themselves alone seem to have an absolute 0 chance of spawning Spikes along with them
Which is really weird... like how are they both coded? Are Retrodes actually coded with a "Construct" tag? Do the spikes check for Constructs or a specific list of monsters which is all the construct names?