I faced some problems changing to z4h and wanted to send some feedback for whoever is also facing that in the future or that the defaults for new users will get updated.

First one is:

zstyle ':completion:*'                       special-dirs       true

I was wandering why i was not able to complete cd .. with TAB to ../

This was working without actually doing anything for years and in z4h it did not work - i was very sad about that until a few minutes ago.

Second one is:

zstyle ':z4h:fzf-dir-history'                fzf-bindings       tab:repeat 
zstyle ':z4h:fzf-complete'                   fzf-bindings       tab:repeat
zstyle ':z4h:cd-down'                        fzf-bindings       tab:repeat

This will only work if nothing else is rebinding TAB after fzf-tab has been initialised. Try to not do that and that nice feature will work.