First time use of the Library bug
Hardly worth reporting but happens consistently for me: the first time I use the Library after opening Illustrator, upon choosing what I want to place, the library panel closes (before I can complete the place command). When I open the palette again and choose the item, it works fine. That's it.
Version 26.0.2 (64-bit)
Windows 10 Enterprise
Does not happen for me on Windows.
There must me a difference in our setups.
Please tell more — is the panel docked? grouped? free-floating?
How do you place a link? by dragging? with a context menu?
Record a video of you trying, if it is reproducible for you.