calling `batchMap` + `submitJob` in a loop triggers "Registry must be empty" error

I would like to call `batchMap` + `submitJobs` in a loop to send a bunch of jobs to the cluster. Then, wait for everything to finish. However, I trigger this error:

https://github.com/mllg/batchtools/blob/1196047ed5115d54bde2923848c1f3ec11fda6d2/R/batchMap.R#L61C1-L62C35

Is this simply not possible?