I also cannot reproduce in vanilla.

I think what was happening was that during the auto save the user was issuing commands and mistook what was happening for a glitch

The user feels embarrassed, but, ultimately, happy that Factorio has been vindicated.

I have been playing this game since at least 2016 and I never though I would find a glitch! Very excited at the potential; however, it is likely already known, given how amazing this game is and the player base :)

To create the glitch: If you "SHIFT + Left Click" your Spidertron with its remote, so ...