I had a cray gun (A subframe cray gun, by zqasd) and I tried to use PROT on it with life 2, the beam instantly vanishes as intended, but when touching any other material (or atleast TUNG) it will just float about until it hits empty space.
I can't actually tell if it's a bug or not, soo...
Seems to be intentional, unless this refers to something else.