Latest fontconfig-update changed the location of the 11-lcdfilter*.conf files from /etc/fonts/conf.avail to /usr/share/fontconfig/conf.avail/.
If anybody has symlinked one of those in /etc/fonts/conf.d/ - the symlinks will need to be adjusted accordingly.
edit: Just “found” the noto-fonts-compat package on one of my systems, which probably wants to adopt those path changes as well @philm?