...Hi,
I did a little troubleshooting as I found what you said so hard to believe - not you but its not working, and to not give you a rubbish circuit either. I have found something - perhaps obvious - out:
At 4.76V supply and the switch is a rocker switch in my case:
The LMC555 works perfectly every time when I flick a rocker switch to on with the component values in the schematic.
The SE555 works terribly with the exact same circuit. However, it works perfectly again by only changing C1 to a 22uF capacitor. Or, importantly, it also worked every time by switching it on and off repeatedly "slowly" in comparison to 4 times a second with the LMC, maybe only 1 or 2 are possible with the SE (Maybe NE and SA and all the rest will be the same, TLC may be same architecture as LMC, not sure.)
I can only conclude that the SE is not so great at being turned on and off several times a second because it is slower than the LMC. The SE works once, twice, maybe peters out at switch on #3 and forget number four even doing anything, like it's running out of energy somewhere vital as a visual symptom. I don't know why but the LMC is designed for MHz and the SE for kHz and it looks like that is the culprit for not ideal repeatability/reliability. I guess, and it's a big guess, that for fast switching on and off as I was doing - even if not maybe your problem - the pin 6 charge signal level needs to be somewhere it can't reach with a smaller capacitor value. Tin foil hat man theory, maybe.
The other issues you talk about perplex me. It may be related to the switch/momentary pushbutton that turns on your longboard and how it operates or the 42V is generated - maybe it has a soft-start that interferes with clear switching at the 555 trigger, lord knows how but it's a possibility to consider.