The CK Editor toolbar is overlapping with the Admin toolbar

As CKEditor (4) module is no longer in core, I assume this bug is for the current module.

The toolbar is working as expected. I was not able to reproduce the issue. The CKEditor toolbar is sticky only when in focus and is positioned correctly below the admin toolbar.

Issue is reproducible. The Ckeditor Tool bar Overlaps the admin menu

Steps to reproduce
1. Go to any node create/edit page
2. Switch to Full HTML format in ckeditor
3. Click on any component i.e paragraph or styles to make toolbar active .. Open dropdown and scroll
4. Scroll down until the CKEditor toolbar reaches the top of the page.

This issue replicated on macbook as well,

chrome

safari

firefox

Changing z-index will work on this.

.ck.ck-sticky-panel .ck-sticky-panel__content_sticky {
z-index: 1;
}

Verified that, the issue is reproducible. The Ckeditor Tool bar is Overlapping the admin menu

Steps to reproduce
1. Go to any node create/edit page
2. Switch to Full HTML format in ckeditor
3. Click on any component i.e paragraph or styles to make toolbar active .. Open dropdown and scroll or select anything in dropdown
4. Scroll down until the CKEditor toolbar reaches the top of the page.

Raised MR to change z-index.

I tried MR !6034 but it still show the same issue. the issue is not only comes with Full HTML but also Basic html.
Please see below attachments that how looks ckeditor toolbar after apply MR.

The issue is still reproducible if the dropdown is kept open and scrolled.

The issue is resolved if the dropdown is closed and the toolbar is active

Steps to reproduce
1. Go to any node to create/edit the page
2. Switch to Full HTML format in CKEditor
3. Click on any component i.e paragraph or styles, keep the dropdown open and scroll
4. Scroll down until the CKEditor toolbar reaches the top of the page.

Added changes for changing the z-index of dropdown-panel

All ToolBar Overlapping issues resolved. Verified for Full HTML Editor with open and closed dropdown state. Also verified for Basic HTML editor.

Moving Issue to RTBC ++

Testing Steps :
1. Go to any node to create/edit the page
2. Switch to Full HTML format in CKEditor
3. Click on any component i.e paragraph or styles, keep the dropdown open and scroll
4. Scroll down until the CKEditor toolbar reaches the top of the page.

Why is it that only the ckeditor dll is changed? there is nothing I can review here.

Please post the steps you took to make the change as I can't review an already built file that comes from a third party.

Changes to CKEditor's dll files should be avoided as it would be overwritten with CKEditor 5 version upgrade.
I have prepared a css fix that works for toolbar and powered by badge.
I'll create PR later today or tomorrow as currently at #WarsawContributionWeekend2025 I don't have access to my main account.

Friends, please: There's just one ContributionWeekend tag. We want to count all issues afterwards easily and have them all show up on one page easily.

Thank you! Happy contribution weekend everybody 🤗