Can't uncheck "hide plugin" from plugin manager

If plugin is used in the project I can’t uncheck it the box is inactive.

For example, I used a plugin a long time ago and saved it within a project but later hid the plugin from appearing in my list (d/t not being used anymore). So I reopen this old project that has this plugin and would like to use it on some other sounds. But since it’s hidden I go to the plugin manager and try to un-hide it… no dice. The box is perma-checked and won’t let me make it make it available.

I have to close the project, re-open the window, un-hide it and then reopen the project.

Strange bug.

v. 10.0.50