Outdated add-ons, Bug Sur

To my knowledge,
There is no plist or anything that RapidWeaver uses to keep track of plugins.

It is simply the location (that you can set) for the plugins folder. It then “Builds” the plugins on the fly at launch. If you disable a plugin, it moves the plugin to a folder called Plugins Disabled.
So what I suspect is RW is pointing to a different location than you think for the addons folder.

If you close RW down and reopen with the option key, you can disable all 3rd party plugins and get RW launched. Then I’d go to the addons manager and Reveal in Finder and check what is there.

2020-12-31_12-54-52