When I launch emacs (emacs-next) with the emacs-lua-mode package, I'm getting this error
"Error (use-package): lua-mode/:catch: Unknown rx form ‘symbol’"
It works when I let emacs download it from melpa. I tried updating emacs-lua-mode to 20200508, which is the same version as on melpa.
Still the same issue.
Could this be an issue that it's using emacs-minimal-26.3 to byte compile the files? Where I'm using emacs-next aka emasc-27.0. Judging by this issue  the rx package has gone through some changes in 27.0.
I've attached the backtrace and the patch for the latest emacs-lua-mode.