Traffic lights appear on new tab page in fullscreen because of missing vertical padding

Steps to reproduce:

1. Turn on vertical tabs
2. Go into fullscreen
3. Disable "Always Show Toolbar in Fullscreen"

Expected behavior:
The window switcher should have some vertical padding when the title bar is hidden to avoid looking weird

Orion, OS version; hardware type:
macOS Sonoma, Orion RC 125.1, M1 Pro 14"

Image/Video:
When title bar is shown:

When title bar is hidden (this image is not cropped, it really does go up to the top of the screen):

The toolbar overlaps with the vertical tabs sidebar when the "Always show toolbar in fullscreen" is disabled.

Steps to reproduce from a clean profile:

1. Disable the "Always show toolbar in fullscreen" option.
2. Make the window full screen.
3. Open the vertical tabs sidebar.
4. Focus on the vertical tabs sidebar by clicking on another tab or creating a new tab.
5. Note that the toolbar shows and overlaps with the sidebar.

The toolbar should not overlap with the vertical tabs sidebar.

Version 0.99.129.4-rc (WebKit 621.1.2.111.4)

Sequoia (15)

Does not happen in safari, but when you open the start page, even if its not with Command T, the traffic lights appear like they do in the attached screenshot, and it doesn't look quite right.
My tabs settings are as follows, and the issue still occurs without extensions.

When opening the start page, I would expect the traffic lights to not show up, or if they have to it would look like the image attached.

Version 0.99.130.2-beta

Sequoia (15)