storage.mount() irregular behaviour when mounting to a non-top-level directory #9045
Description
CircuitPython version
Adafruit CircuitPython 9.0.0-rc.0-8-g4f0da18204 on 2024-03-12; Seeeduino Wio Terminal with samd51p19Code/REPL
>>> import os
>>> os.listdir("/")
['.fseventsd', '.metadata_never_index', '.Trashes', '.Trash-1000', 'Beryllium', 'code.py', 'boot_out.txt', 'repl.py', 'boot.py', 'settings.toml', 'LOST.DIR', 'Music', 'Podcasts', 'Android', 'Ringtones', 'Alarms', 'Notifications', 'Pictures', 'Movies', 'Download', 'DCIM', 'Documents', 'Audiobooks', 'Recordings', 'lib']
>>> import board, sdcardio, busio, storage
>>> spi = busio.SPI(board.SD_SCK, MOSI=board.SD_MOSI, MISO=board.SD_MISO)
>>> sdcard = sdcardio.SDCard(spi, board.SD_CS)
>>> vfs = storage.VfsFat(sdcard)
>>> storage.mount(vfs, "/Beryllium/mnt")
>>> os.listdir("/")
['Beryllium/mnt', '.fseventsd', '.metadata_never_index', '.Trashes', '.Trash-1000', 'Beryllium', 'code.py', 'boot_out.txt', 'repl.py', 'boot.py', 'settings.toml', 'LOST.DIR', 'Music', 'Podcasts', 'Android', 'Ringtones', 'Alarms', 'Notifications', 'Pictures', 'Movies', 'Download', 'DCIM', 'Documents', 'Audiobooks', 'Recordings', 'lib']
>>>Behavior
'Beryllium/mnt'????????????
Description
The mnt directory exists and is empty.
The mount is in fact not attached there, but to the literal "Beryllium/mnt".
Additional information
No response