OCR service stoped with "TypeError: Failed to fetch."

[Tsyshiu]

Operating system

Windows

Joplin version

3.3.12

Desktop version info

Joplin 3.3.12 (prod, win32)

device：win32, Intel(R) Core(TM) i5-8265U CPU @ 1.60GHz
client ID: 1d88880102c741ccbea062ce30580f37

Backup: 1.4.3
Freehand Drawing: 3.0.1

Sync target

WebDAV

What issue do you have?

1. when i clicked the context menu on a png screenshot, it tells "This attachment does not have OCR data (status: Idle).
2. Due to the problem mentioned in 1, I suspected that the OCR pre-scan was not fully executed. So, I clicked "Clear cache and re-download language data files", and then noticed in the logs that the OCR stopped(no more OCR related logs) after processing the 5th attachment. And the error is "TypeError: Failed to fetch."
   Thanks for your support! I wonder if I am messing up configs somewhere?

Screenshots

Log file

-1749020146157.log (20.1 KB)