Deep nested navigation jumps to root instead of immediate parent

[wolfgang-stark]

Check that this is really a bug

• [x] I confirm

Reproduction link

https://codesandbox.io/p/sandbox/swiper-nested-forked-39fd3l

Bug description

In deeply nested Swiper configurations navigation skips intermediate levels and jumps directly to the root level instead of navigating to the immediate parent.

Slide Structure: 1 | 1.1 | 1.1.1 2 | 2.1 | ....

Steps to Reproduce:

1. Swipe RIGHT to go from 1 → 1.1
2. Swipe RIGHT to go from 1.1 → 1.1.1
3. Swipe LEFT to go back
4. Expected: Should go 1.1.1 → 1.1
5. Actual: Jumps 1.1.1 → 1 (skips 1.1)

Expected Behavior

When navigating back from a deeply nested swiper (e.g., 1.1.1), swiping left should go to the immediate parent (1.1).

Actual Behavior

The bug is that when at 1.1.1 and swiping left, instead of going back one level to 1.1, it jumps all the way back to the root level 1.

It seems to be a fundamental issue with the architecture: event propagation with multiple slider instances

Swiper version

11

Platform/Target and Browser Versions

macOS Safari / Chrome

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?

• [x] I'm willing to open a PR