external tcs getting deleted

[subway]

so i have played rust for a little bit now w some friends and as i was building externals i came to notice that 3 of the tcs had been broken but i still had build priv can someone enplane what happened (note i know no one destroyed them because i was out side my base building)

[BOYD]

Maybe your " Externals " were connected to the main building, Overlapping tcs causes them to break.