Ok, I have KC 4.0.5 and that’s the only NE555 symbol that shows up.
Ok, Need to remember! I changed the VCC on the 555 to +6V and added a power flag and it seems to have fixed the issue in PCBNew. Will check. I gather having first flagged the IC’s with 2.5V it took that as being VCC and not 12V.
For the hell of it I removed R18 the zeners resistor and added a 12V power symbol after the fuse. It has now changed VCC to 12V and I have a direct connection between 2.5 and 12V O’well seems like something important to remember.
Sadly some of the symbol libraries are in a quite bad shape. (especially the symbols in the logic family libraries.)
If you want to look into modifying the symbols, in this topic i described a way to do it efficiently.
It is not as much work as you might think.
(I also described the finer details on how this “feature” you discovered works.)