KB Public menus scroll bar positioning incorrect

[MrGeneration]

Infos:

• Used Zammad version: develop 5.1 as of 11th March
• Installation method (source, package, ..): any
• Operating system: any
• Database + version: any
• Elasticsearch version: any
• Browser + version: any; verified on Opera v84

Expected behavior:

Scroll bar positioning is always on container borders.

Actual behavior:

Opening the edit screen for knowledge bases public menu the scroll bar is shown out of boundary (not on the window border)

Steps to reproduce the behavior:

• go to KB settings and adjust your public menu URLs. This may require you to reduce your viewports size so that the dialogue gets bigger than your viewpoint (vertically)

Yes I'm sure this is a bug and no feature request or a general question.