Thanks for the steps above. None have made a difference to the issue.
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Switched to default WordPress 2022 theme - issue still present.
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All plugins were deactivated - issue still present (tried with both 2022 theme and Pro theme)
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All themes fully updated (all plugins and WP core also fully updated) - issue still present.
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Switched to Pro theme (rather than Pro Child) - issue still present.
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Removed all Global CSS (none present on Layout). Also removed header and footer, so just the blog layout loading - issue still present.
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Cache disabled and deactivated - issue still present.
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There is no CDN present.
Additional steps taken were to remove any additional code in functions.php - issue still present. I have also deleted and recreated the blog page - issue still present.
I have set-up a staging version of the website (details in Secure Note) where you can do what you want!
One final thing - if I change the homepage settings in Settings > Reading to Your latest Posts, the blog navigation works partially, but displays page 1 on page 2.
Thanks,
Christopher