Neovim: brew upgrade neovim --with-python issues

[AbhimanyuAryan]

I was using neovim installed by homebrew earlier but it wasn't using python. Please check this issue for errors I got with omnisharp-vim & neovim support.

Then what I did was brew upgrade neovim --with-python to fix this error. Now I get new errors. Please help me with what's wrong. Thanks

❯ nvim
function <SNR>61_InitializePythonBuiltin[23]..provider#python#Call[9]..remote#host#Require[10]..provider#pythonx#Require, line 15
Vim(if):E475: Invalid argument: Channel id must be a positive integer
Failed to load python host. You can try to see what happened by starting nvim with $NVIM_PYTHON_LOG_FILE set and opening the generated log file. Also, the host stderr is available in messages.
Error detected while processing /Users/abhimanyuaryan/.dotfiles/config/nvim/plugged/ale/after/plugin/ale.vim:
line   28:
E605: Exception not caught: ALE conflicts with Syntastic. Uninstall it, or disable this warning with `let g:ale_emit_conflict_warnings = 0` in your vimrc file, *before* plugins are loaded.
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[justinmk]

Where did brew upgrade neovim --with-python come from?

:checkhealth explains what to do, as does the FAQ https://github.com/neovim/neovim/wiki/FAQ#python-support-isnt-working