Initial Tmux instance doesn't see environment variable?

[enoryw]

I have Tmux auto-started and when I launch fzf --tmux it doesn't respect FZF_DEFAULT_OPTS even though echo $FZF_DEFAULT_OPTS show the intended values inside tmux. This applies to new sessions as well.

If I start a new instance of Tmux with tmux -L test, then fzf --tmux respects $FZF_DEFAULT_OPTS.

How to fix this? In my tmux.conf I have set-option -g default-command "$SHELL" and I suppose that's responsible. I have this because .zprofile for login shell has stuff that should only be run once on initialization and I don't want it running stuff for every panel that gets created. I could move definition of environment variables to .zshrc but I have good reasons to prefer .zprofile.

[nicm]

How the environment works in tmux is described here: https://man.openbsd.org/OpenBSD-current/man1/tmux.1#GLOBAL_AND_SESSION_ENVIRONMENT

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