Well my assumption is wrong about the spaces around the pipe because as you said my steps to reproduce do work… Sorry.
I have files with a uuid as the name, and this is what happens to me:
See the Online events markup, I cmd+shift+clicked it and it opened the right note. But when I focus it it isn’t on backlinks and it does show on unlinked sections with the paragraph I just came from.
I tried to re-test the simple example by changing the file names to have - in them or putting them on a subfolder (all my files are in a content folder), but those worked well. I am not sure of what else I could try to test why this didn’t work 