Unable to paste code with indentation into mosh

I get errors when I paste indented code from my Mac into mosh. The indentations add up each line and the text gets further out with each indented line. This makes my Python code not run.

Use case: I often use Spark clusters from the master node via ssh and want to use mosh to do the same without worrying about the connection dropping and losing my work. As far as connections staying up it is great, but I can't paste code from a file and watch it run, which kills me. I end up trying to remove indentation and do things all in one line, and finally give up and use ssh, which drops connections :( I've tried screen and tmux.

Is there a way to get this to work through mosh? It works seamlessly through ssh.

Start by reproducing the indentation growth when pasting Python code from a Mac into a mosh session, then compare the same paste through ssh and with screen or tmux. Done means indented code pastes and runs correctly through mosh without the indentation accumulating on successive lines.