I had an issue with my site running Craft 3.1.15 where I wasn't able to update the site to the most recent 3.1.16, and also wasn't able to install any plugins. Every plugin I tried would throw this error:
Blockquote Invalid plugin: No plugin exists with the handle "plugin-slug"
I tried creating a fresh install of craft through composer, this time running 3.1.16, and I'm faced with the same error. All my other craft sites run locally seem to update fine and have no issues installing new plugins. Is there an issue with the latest craft updates? Or is there something I need to do to resolve this?