No-change opening of preferences refreshes the cache

[LinuxOnTheDesktop]

Describe the bug
No-change opening of preferences refreshes the cache.

To Reproduce

1. Open the Update Manager.
2. Open its Preferences.
3. Close its Preferences.
4. See the Update Manager 'refresh' pointlessly.

Expected behavior
No 4.

Distribution:

• Linux Mint
• LMDE
• Other (please specify)

Software version:
6.0.9

[github-actions]

This issue has been automatically marked as stale because it has not had
any activity in over 2 years.

If this issue is still relevant:

• Please test on a current version of this package.
• Add a comment with your findings

If no activity occurs in the next 30 days, this issue will be
automatically closed. Issues can be reopened if needed.

[LinuxOnTheDesktop]

This problem persists on Update Manager 7.1.4.