initialSlide parameter doesn't work

[mayhew3]

Check that this is really a bug

• [X] I confirm

Reproduction link

https://codesandbox.io/p/sandbox/swiper-navigation-forked-5flyyg

Bug description

The initialSlide option works if it is an attribute in the HTML tag, but not if it is a JS option.

Expected Behavior

Expect the slides index to start at initialSlide.

Actual Behavior

It starts at the first slide, no matter what value is in there.

Swiper version

11.1.14

Platform/Target and Browser Versions

Windows 11

Validations

• [X] Follow our Code of Conduct
• [X] Read the docs.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• [X] Make sure this is a Swiper issue and not a framework-specific issue

Would you like to open a PR for this bug?

• [ ] I'm willing to open a PR