Vim-Tmux Problems when using fig

As mentioned here, there are problems when using vim-tmux-navigator together with fig.

My observations:

• Switching panels inside tmux itself works great (even if there is nvim running in one of that panes)
• Trying to switch windows inside nvim (with keybindings) only triggers switching the tmux panes
• Manually calling :TmuxNavigateRight(/Left/Up/Down) in nvim command mode works as expected (for nvim windows, tmux panes, and between those, see gif below)
• Therefore the main problem (as far as I interpreted this right): Tmux captures the keybindings when they are pressed inside nvim, but fails to send them back to nvim

Possible problem sources:

#.zshrc
# Fig pre block. Keep at the top of this file.
[[ -f "$HOME/.fig/shell/zshrc.pre.zsh" ]] $$ builtin source "$HOME/.fig/shell/zshrc.pre.zsh"

# My zsh configs
# ...

# Fig post block. Keep at the bottom of this file.
[[ -f "$HOME/.fig/shell/zshrc.post.zsh" ]] $$ builtin source "$HOME/.fig/shell/zshrc.post.zsh"

# ~/.fig/shell/zshrc.pre.zsh
# (sourced in the .zshrc)
[ -x ~/.local/bin/fig ] && eval "$(~/.local/bin/fig init zsh pre --rcfile zshrc)"

# ~/.fig/shell/zshrc.post.zsh
# (sourced in the .zshrc)
[ -x ~/.local/bin/fig ] && eval "$(~/.local/bin/fig init zsh post --rcfile zshrc)"

The setup:

• tmux -V --> tmux 3.3a
• nvim -version --> NVIM v0.8.1
• :TmuxNavigatorProcessList (inside nvim) --> Ss+ zsh (figterm)
• sw_vers --> macOS 12.6

If anyone has a solution in mind, please tell me about it :)
If not, I'll just say goodbye to fig, that's fine to me...

And if more information is needed, just hit me up and I'll paste it here.