When saving files, the lisp files for some style files (e.g. expl3, minted) call font-latex-update-font-lock, which has the following lines to revert the font locking to defaults (around line 1287-88 of font-latex.el):
(setq font-lock-set-defaults nil)
(font-lock-set-defaults)
This removes any font locking done by minor modes (e.g. hl-todo-mode, outshine-mode). There should be another way of applying these styles that does not override previously set font properties, or reapplies the font lock applied by minor modes.
Emacs : GNU Emacs 26.3 (build 1, x86_64-apple-darwin18.7.0, Carbon Version 158 AppKit 1671.6)
of 2019-10-19
Package: 12.1.2
- Prashant