A strange stretch distortion on the left of sidebar when you choice sidebar pops up on the left side

[EVANGELION-Air]

Describe the bug

I guess this stretching effect was not the original intention of the design, because it even distorted the text. Also, everything behaves normally if you select sidebar pops up on the right side, just like the original firefox design.

Expected behavior

No response

Screenshots

No response

OS

Windows 11

OS - Others

No response

Firefox Version

120.0.1

Distribution

• [X] Original Lepton
• [X] Lepton's photon style
• [X] Lepton's proton style

Theme

• [ ] Light
• [X] Dark
• [ ] Alpenglow (System: Light)
• [ ] Alpenglow (System: Dark)
• [ ] System Default
• [ ] Others: (e.g. Photon Colors, Google Chrome Dark, Fairytale Of Nature)

Theme - More Info

I don't change anything

user.js setup

I don't change anything

Additional context

No response