Ah.... now I get it. When "just adding" the the FS in HDToolbox, its DosType is 0x444F5303 and that's get written to the RDB.
When adding it AND changing DosType to 0x444F5307, the FS-Name changes from International (FFS) to Long Name (FFS)
I just assumed adding the FS and enabling the "Long names" checkmark on the partition settings was enough. Now, this explains it all. Thanks Thomas!
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