Problem with thumbnail carousel when using a keyboard

[Equipement]

Checks

• Not a duplicate.
• Not a question, feature request, or anything other than a bug report directly related to Splide. Use Discussions for these topics: https://github.com/Splidejs/splide/discussions

Version

v4.1.4

Description

Hello,
In this page https://splidejs.com/tutorials/thumbnail-carousel/ , when i use the keyboard (and not the mouse) on the introduction example, i can navigate (with the "Tab" key) to :

• the left arrow
• the right arrow
• the thumbnail 1, the thumbnail 2, the thumbnail 3, the thumbnail 4, the thumbnail 5

But i can't navigate (with the "Tab" key) to :

• the thumbnail 6, the thumbnail 7, the thumbnail 8, the thumbnail 9

Thank you in advance for your answer.
Best regards.

Reproduction Link

https://splidejs.com/tutorials/thumbnail-carousel/

Steps to Reproduce

Use the keyboard (and not the mouse) on the introduction example, and try to navigate (with the "Tab" key) to the thumbnail 6, the thumbnail 7, the thumbnail 8, the thumbnail 9.

Expected Behaviour

When using the keyboard (and not the mouse) on the introduction example, i expected to navigate (with the "Tab" key) to each thumbnail and not only the 5 first thumbnails.