variable window sizes in tmux integration not working - both windows change size

I am trying out the new "Allow variable window sizes in tmux integration" feature. It works for me locally on my Mac. But when I use it in a ssh session to a remove linux server both windows resize as before. Thanks!

• iTerm2 version: Build 3.3.0beta16

• OS version: 10.14.6 (18G84)

• Attach ~/Library/Preferences/com.googlecode.iterm2.plist here (drag-drop from finder into this window) com.googlecode.iterm2.plist

• Attach a debug log, if possible. Instructions at https://iterm2.com/debuglog debuglog.txt.zip

Screencast of issue: https://www.screencast.com/users/studgeek/folders/Jing/media/33670780-56c3-4137-b7da-6f010c0b5f46

Detailed steps to reproduce the problem:

1. Connect to remote server via ssh
2. tmux -CC
3. open second tmux window
4. resize either window

What happened: Both windows resize

What should have happened: Window should resize independently of other window