Oh yeah! It works.
There’s one last thing that used to work and that still works with Flexbox but the option doesn’t seem to be available anymore.
On one site, I can still change the navigation logo in “Primary navigation” instead of “Sticky navigation”.
The result is the Menu Hamburger in the middle and the magnifying glass on the right.

This is on flexbox but I can’t reproduce it.
Is there a trick? Either by triggering the right code with the right hook in PHP or purely CSS.
BTW, this theme is a perfect score in Cumulative Layout Shift. Wow.
Congrats.