Thank you for the fast reply. You're truly awesome. Ok so, down to business.
Have tested on a New Game: Vanilla. Same setup. 1) build beacon + generator 2) wait in a chair for 1 year in cell 3 wait in chair for 1 year in an indoor cell 3) no settlers 4) power cycle to OFF and check the radio stations (Beacon is ON still) 5) run from Sanctuary to The Castle, check radio station (still have Beacon ON at that range) 6) store and scrap Beacon (radion Beacon still ON)
I've also tried Fast Traveling in and out of the cell while the Beacon was OFF, stored, and scrapped. Vanilla fresh save. I also don't use "Don't Call Me Settler" or "Welcome to Goodneighbor" when I do have mods loaded. I'm banging my head against a wall here bro, I really wanna get back to playing FO4 with SS focused playthroughs with the Minutemen. But I've been ironing out my mod lists and various bugs for... at least a month now with no real game time. This is the only big bug I have left and I remember having this bug a few times back when all us Xbox players had was Vanilla, this bug literally killed my Far Harbour settlement builds about 9 months ago and made me walk away from FO4 back then.