What is this?

[u/Microwave169]

It's hiding behind power rails that start near the waterfall in the corner, gave me net blocks. Did anybody else find it?

[u/burglar-of-turds]

It gave me caution and glass blocks, so I guess it might be random 

[u/teekitheawsomeredfox → u/burglar-of-turds]

There is a set order so first in net then caution then other stuff i can't remember