- A robot with char '!' will not appear to blink at all.
- A robot with ANY char that has the same appearance as '!' (e.g. the user cleared both of them) will not blink.
- Something with a palette that makes it invisible (e.g. c77 in regular MZX mode) will not visibly blink.
- Invisible walls will not appear to blink if both char 176 and 178 have been cleared.
This is because flash thing is currently implemented by temporarily modifing the ID char table, meaning the color of the things on the board will never change and the blinking chars can not reliably be expected to appear different from each other.
Originally reported by Graham as part of a different tracker issue.