[Bug] Eden Savegame cannot be loaded with Webstation Streaming #5268

RomM version
5.4.0

Describe the bug
If I start Webstation-romm streaming from a new game without a save, from RomM, it loads fine. I can play the game via Eden in webstation selkies.

However, if I try to stream a game that preaviously had saves, I get errors. MK8 as an example, it says "An unexpected error occurred.
Broker returned 422: {'detail': 'save restore failed: archive member outside save subtrees: 0100152000022000/userdata.dat'}
"

Digging a little in to this, I find that the webstation's allowed tree is defined save_subtrees = ("nand/user/save", "nand/system/save/8000000000000010"), but my save is a "member outside of the subtree", "archive member outside save subtrees: 0100152000022000/userdata.dat"

To Reproduce
Start a gamestream with a Switch game that has previously saved a game. Error appears promptly

Server (please complete the following information):

• OS: Debian
• Version 22

Client (please complete the following information):

• Device: Brave
• Version 1.97

Additional context
No additional context.
I can mention that RPCSX3 does not work with either Vulkan or OpenGL, slows to 1-2 fps, even though nvidia-smi passthrough shows 100% success, with intel cpu.