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It's the little impediments that get us; such is the habitual ingratiousness of the mind.
Tmux has an oversight in that it can't save sessions. With a little Pollyanna power, a frustration becomes an opportunity to learn a bit of scripting.
Here's an example of how tmux sessions can be saved.
https://superuser.com/questions/440015/restore-tmux-session-after-reboot