That isn't a bug.
I've also found that tpt doesn't fullscreen on smaller (15'' diagonal screen) i3 dell computers. it may only be my computer, but IDK
I know that creators of "The Powder Toy" know about a problem with beam of photons ("3 pixels in frame"). I didn't read this page before and published bug: https://powdertoy.co.uk/Browse/View.html?ID=1502759. What do you say? In some cases it can cause grief. For example: if we will open https://powdertoy.co.uk/Browse/View.html?ID=1500500 and transform gold in glass, we can see that laser beam stops. Yes, it is sadness for me, and I hope that someone would hear me.
I found A major glitch with NTCT: NTCT conducts even when it is under 100 Degrees C!
the NTCT part that is malfunctioning is circled in INSL