Critical Issue: 404 “Page Not Found” Error on Custom Post Type Pages

Critical Issue: 404 “Page Not Found” Error on Custom Post Type Pages After WordPress Update

I am writing to report a critical issue on my website, kedaibukitrhema.com, which uses your Prebuilt Cali Sight Pro theme.

After recently updating to the latest version of WordPress, all the pages under my custom post type “My Tourism” are now showing a 404 “Page Not Found” error on the live site. For example, a page that should be accessible is now broken.

I have confirmed from my WordPress dashboard that all the posts and data for “My Tourism” still exist. I can see and edit all the content perfectly on the backend. The issue is only on the front-end; the URLs are not working anymore.

I have also checked that the necessary plugins are active, specifically the Cali Sight Plugin (v1.0.0) which manages the custom post types, and Advanced Custom Fields (v6.5.0).

So far, I have tried the following steps without success:

Clearing all my website and server cache multiple times.

Could you please provide guidance on how to fix this? Is this a known compatibility issue with the new WordPress version?

For your reference, I have attached three screenshots:
1. Plugin Active: https://drive.google.com/file/d/1ABfR-LRayivwJyda1WAtKqq3e7nc5-WX/view?usp=drive_link
2. Article Update: https://drive.google.com/file/d/1FMFrw0u6xLD4KT88N8pPDk4LqbRLDIvj/view?usp=drive_link
3. Error 404 : https://drive.google.com/file/d/1FMFrw0u6xLD4KT88N8pPDk4LqbRLDIvj/view?usp=drive_link

The 404 error on the front-end.

The backend editor showing the page exists and is published.

The list of my active plugins.

Thank you for your time and assistance.

Best regards,

still not solved