Hello. I have noticed that when starting the launcher in Experimental it will scan the mod folders and report that the mods you are subcribed to have been installed - but it is unable to load them automatically afterwards. If you want to join an Experimental server with mods on it, you need to manually navigate to the mod folder and instruct the launcher to load it from there, and then join the server with that preset ("keep current selection and join"). The automation is simply not working for Experimental.
To make matters worse, this action of the Experimental launcher affects the launcher of the Stable branch. If I close the launcher and instead launch stable, the launcher will flag every single mod as "Updated" even though they haven't actually been updated. It still works as expected to join servers though, but the false flag is confusing and downright scary for me as a server owner...