I'm not convinced this is a bug, yet - it might be me missing something or it could be project specific but I tried adding Bull Queues (@tbvgl) to a NodeJS project and it shows as installed but the actions aren't available in the SC API list.
Do you mean you had V1 of the bull extension installed @bpj ? This looks like something is conflicting. V2 requires all files from V1 to be removed before installation.
Can you try completely removing the extension and ensuring there are no files from V1 in routes and modules and then installing V2 again?