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3.0a questions or comments · Issue #1997 · tmux/tmux · GitHub
Oh it's completely different.
スクリーンショット 2020-01-31 18 27 20

Then, I figured out this is BOM.
I wrote init.vim with set bom for mistaken.
I changed it with set nobomb, and it fixed.

Thank you very much for your help, and sorry that this is not tmux bug after all.

Also, backslashes need to be single-quoted now:
Note that you need to change \ to '\' and any {foo} to '{foo}' in .tmux.conf:

bind \ splitw
bind x kill-pane -t {top}


bind '\' splitw
bind x kill-pane -t '{top}'

These will work on older tmux versions also.
bom  tmux  3.x  changelog  upgrading 
yesterday by kme

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