'Why isn't my tmux bind -n M-k copy-mode -u working anymore (on M1 Mac)?

I used to use:

bind -n M-k copy-mode -u

for quite some time now with tmux but all of a sudden after migrating to new M1 Mac it stopped working. The idea behind this binding is to immediately go to copy mode and one screen up.

Similarly bind -n M-j sendkeys Pagedown doesn't work anymore. Anything changed that I missed?

$ tmux -V
tmux 3.2a

EDIT:

It seems that something's catching my Left Alt+k as <CTL-L=FF> (looked up using showkey -a).

The binding does work when bound e.g. to C-k.

tmuxkey-bindings


Solution 1:[1]

It seems that I needed to change it to:

bind -n C-k copy-mode -u
bind -n -T copy-mode-vi C-j send-keys -X page-down

to make this work.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Patryk

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