Motions > Line numbering: Layout issue

[MSoeb]

Description: The font size of the line numbering changes depending on the menu from which you navigate to the motion. The line numbers become larger. They only return to their original size after a reload.

Reproduction:
The problem is, that I can't reproduce it. It's clearly visible on our Staging instance, but after reload it's gone until something, which is unclear, triggered it again. - Contact me for Details.

What should happen:
By navigating accross the instance the line numbering should not change the font size by opening a motion.

[Elblinator]

the correct class for the numbering seems to be
.motion-text.line-numbers-outside .os-line-number:after

the :after is missing when the numbering doesn't look right,
here the loaded font-size is 0