I have tried Jerboa and Liftoff until now, and both have issues loading the "subscribes"-list from Lemmy.world.

There are no issues loading the "all"-list. I also have an account on feddit.nl, and for that account, it works just fine.

EDIT: okay, so I just noticed that when I go the account settings in Liftoff (I don't have Jerboa installed currently), I can edit me account-details for the feddit.nl-account (like upload an avatar or change displayed name). When I click on the dot world-account however, I get an error-messge: "Error: null check operator used on a null value". No idea if this is useful or not?