Mate desktop - padlock icon for read-only files is wrong

I use Mate with the clearlooks-phenix theme and for the past long time (back through at least Centos 8 and maybe Centos 7) the padlock icon for a read-only or not available for the current user file is wrong. Instead of a padlock I get what I guess is a generic document icon, or at least it looks like a piece of paper with writing on it so I suppose that’s what it’s supposed to be.

The little squares beside audit, chrony etc directories used to be padlocks.

Does anybody know where the padlocks went? A padlock makes more sense and is prettier in this context.