TQFolder::writeToFile argument "keepInMemory" doesn't work as intended

when using write splitting and keepInMemory, the following errors occur:

ERROR in TQFolder::resolveImportLink(...) : unable to resolve import ImportLink ':--HWWRun2GGF-.Histograms-Nominal' from directory './workspaces/run2-ggf-stxs1-legacy/model-simple.root'