FF89: Tabs are "bugging" if I pin one and open many

[Ninrazer]

Sanity checks (must complete)

• I have read and followed the installation instructions in the README
• I have not modified the userChrome.css file
• I have tested the latest release for my Firefox version, or commit on master/beta branch (beta is for Firefox Beta only)

Describe the bug
If I open many tabs (enough to decrease the tab size) while having a pinned tab, all the tabs start to "bug".

To Reproduce
Steps to reproduce the behavior:

1. Pin a tab
2. Open enough tabs to have them decrease in size
3. Tabs start "bugging"

Screenshots

materialfoxbug.mp4

System info

• OS: Windows 10
• Firefox version: 89

[muckSponge]

Thanks for reporting. I have managed to resolve this issue in a small scale prototype but it's a bit difficult to integrate into the full theme – a lot of big changes needed. Can't promise a fix any time soon unfortunately (no time these days), but it is on my radar for when I have time.

[Ninrazer]

No problem, it isn't a big issue anyway.
Thank you for your time and commitment to the theme! :)