File search on external storage not showing result

Nextcloud version (eg, 20.0.5):
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04.3 LTS
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.41
PHP version (eg, 7.4): 7.4.24-1+ubuntu20.04.1

The issue you are facing:
Most of users has files on Windows FS, with is mounted as an external storage in NC, no problem accessing the files and work with (the OS doesn’t mount anything from the FS).
Searching for any files located on the external storage cannot be found in search results. To be clear, not full text search, only file name search.
Searching in DB oc_filecache table gives results, for example 3 result is given in the sql command line search, the files exists on the external FS server.

What can I do to make the files appear in the search as it shows up in cmdline sql search?
Thank you for your help!

Is this the first time you’ve seen this error? (Y/N):
Steps to replicate it:

  1. search anything on external share
  2. wait for result
  3. wondering where the results are

No extra log found in NC log, PHP log or Apache2 log.