Hi Ihor,

> Considering that you can only reproduce with Spacemacs, it might be
> spacemacs screwing the match data. Not Org.
> There is no reason to fix something not caused by Org on Org side.

Agree with you, I had located the dead loop is cause by the advice function for set-window-buffer from evil package, in which the function will screw the match data.
I had posted a patch to the evil-package to fix this issue.
https://github.com/emacs-evil/evil/pull/1724/files

Please mark this ticket as closed if you wish. Thank you

Lin