Mysterious (possibly original? Cornell Dubilier Beaver) capacitor not in schematics

[Madeline12]

I apologize for all the questions, but this one has still stumped me… while working on replacing components in this old Stewart-Warner 9121A television, I found an electrolytic capacitor that was connected from pin 8 on a 6W4GT tube socket (horizontal damping) to pin 3 on a 6CD6G tube socket (horizontal scanning output). Note… it may be tough to read on the scan, but pin 8 is marked as ground on 6W4GT. The capacitor is rated at 12uf 150V. I am not seeing this capacitor listed anywhere on the parts list, nor the schematics. I’m curious as to why this was in there… normally I’d assume someone in the past maybe soldered it in for whatever reason and it wasn’t original, but from what I’m learning, this capacitor does possibly seem to match the time that this model was released (1951). Can anyone provide some insight as to why this may be here, or if I should replace it? Or should I just remove it entirely?

Attached are some snippets of the schematics: