File is "missing" in the FUSE mount, but exists in the Filer

[Suika]

Describe the bug
Sonme files that were added through weed filer.copy to a bucket seem to exist in the filer and can be accessed, but the FUSE mount does not show the said filer.

File exists in Filer/Volume and can be accessed:

$ wget --spider http://10.0.0.149:8888/buckets/three/folders/here/448fc478ee6aa1dddc8797417b82aa1c459c967374e9784c845aff1fc9b21b3e.jpg
  Spider mode enabled. Check if remote file exists.
  --2021-01-30 14:34:52--  http://10.0.0.149:8888/buckets/three/folders/here/448fc478ee6aa1dddc8797417b82aa1c459c967374e9784c845aff1fc9b21b3e.jpg
  Connecting to 10.0.0.149:8888... connected.
  HTTP request sent, awaiting response... 200 OK
  Length: 70891 (69K) [image/jpeg]
  Remote file exists.

But does not exist in the mount.

$ stat /mnt/weed/buckets/three/folders/here/448fc478ee6aa1dddc8797417b82aa1c459c967374e9784c845aff1fc9b21b3e.jpg
  stat: cannot stat '/mnt/weed/buckets/three/folders/here/448fc478ee6aa1dddc8797417b82aa1c459c967374e9784c845aff1fc9b21b3e.jpg': No such file or directory

System Setup

• Seed Docker setup in Max number of volumes on volume server are not recalculated on diskspace change #1594 but with newer seaweed version
• Debian 9
• version 8000GB 2.22 2c5eac5 linux amd64
• default filer.toml
• FUSE: weed mount -filer=localhost:8888 -dir=/mnt/weed -cacheDir=/snapraid/storage_c2/test/seaweed-cache -cacheCapacityMB=0

Expected behavior
All files that are accessible via the Filer should be accessible via the FUSE mount.

Additional context
The FUSE mount was never unmounted throughout the whole duration of filer.copy and the subsequent file checks.