grid option inside thumbnail slider not working (isNavigation)

[MiGoep]

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

4.0.6

Description

I'm trying to link the grid option with the Thumbnail Slider (isNavigation). The grid works, but the synchronization doesn't. Clicking on the thumbnails does not update the main slider or slide it further.

Could it be that mixing these two options doesn't work?

Reproduction Link

No response

Steps to Reproduce

`
var thumbnailSliderSplide = new Splide("#thumbnailSlider", {
isNavigation: true,
pagination: false,
arrows: false,
grid: {
rows: 2,
cols: 6,
gap : {
row: '0.5rem',
col: '0.5rem',
}
},
}).mount(window.splide.Extensions);

var largeImageSliderSplide = new Splide("#largeImageSlider", {
type: "slide",
rewind: true,
speed: 1000,
pagination: false
}).sync(thumbnailSliderSplide).mount(window.splide.Extensions);
`

I also tried without using "window.splide.Extensions" on largeImageSliderSplide.

Expected Behaviour

Click on the Thumbnail Slider elements should sync with largeImageSliderSplide and go the same index.