Sometimes Permalink structure on WordPress  is corrupted.
You can recover from that situation with disabling Redis Object Cache and updating Permalink structure.

Step 1. Select [Settings] Menu on left sidebar, then click [Redis] menu.

Step 2. Click [Disable Object Cache]

Step 3. Redis Object Cache has been disabled

Step 4. Click [Permalinks] menu then [Save Changes] button without changes anything to force update Permalink structure

That's all.
Let's check Permalinks are updated.
Make sure enable Redis Object Cache plugin again before terminating WordPress.

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