I use VSCode on macOS, I ssh into Linux remote station and here I run tmux (inside VSCode integrated terminal). However, I am not able to copy any text from tmux into system clipboard when used like this. I am not even able to select the text using mouse - when I select any the selection highlight disappears immediately.
The copying to system clipboard works if:
How to copy text from tmux inside VSC integrated terminal?
Solved using the mouse while holding Alt (Option) key. This way I can copy text from Tmux inside VSCode.
EDIT: You also want to set
"terminal.integrated.macOptionClickForcesSelection": true
as @hulius suggested