Classic editor: Metabox switches to Readability tab

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• I've searched for any related issues and avoided creating a duplicate issue.

Please give us a description of what happened

To Reproduce

Step-by-step reproduction instructions

1. Install 26.0 Free+ Premium + Classic editor
2. Edit post and check yoast metabox and wait for few seconds

Expected results

1. SEO tab is opened

Actual results

1. Metabox switched to Readability tab
   Could be related to wp-json/yoast/v1/introductions/ai-optimize-classic/seen/?_locale=user endpoint

Screenshots, screen recording, code snippet

If possible, please provide a screenshot, a screen recording or a code snippet which demonstrates the bug.

Technical info

• If relevant, which editor is affected (or editors):

• Block Editor
• Gutenberg Editor
• Elementor Editor
• Classic Editor
• Other:

• Which browser is affected (or browsers):

• Chrome
• Firefox
• Safari
• Other:

Used versions

• Device you are using:
• Operating system:
• PHP version:
• WordPress version:
• WordPress Theme:
• Yoast SEO version:
• Gutenberg plugin version:
• Elementor plugin version:
• Classic Editor plugin version:
• Relevant plugins in case of a bug:

Reproduce the issue in the Classic editor with Yoast SEO 26.0 Free and Premium, then inspect the metabox behavior around the wp-json/yoast/v1/introductions/ai-optimize-classic/seen/?_locale=user endpoint. Trace why the metabox switches tabs after loading; done means the SEO tab remains open after waiting.