What I’m trying to do
I have an internal link to an obsidian note which should open that note. Others with the same syntax work perfectly. I am creating the link by typing two square brackets and then starting to type the file name, till the correct file shows in the list of suggestions, I click on it, and the link is created, as normal. However, in this case, if I then click on the link it creates a new blank note, in the same folder with almost the same name, just a -1 added to the end of the note.
Things I have tried
I have tried repeating these steps in a different note, and the new link behaves exactly the same, creating a new note instead of opening the intended note. Other internal links created today work exactly as they should.
I also tried creating the link using a simple drag and drop of the file into the note where the link should be. Same problem, clicking on the link creates a new note.
Here is the text of the link that is being automatically created (by either approach), which includes the full path to the note:
[[Z. External documents/spreadsheets/radiocarbon_Glykou_etal_2021_input.xlsx|radiocarbon_Glykou_etal_2021_input.xlsx]]
While the links as created for other files with similar names in the same folder look like this, without the full path:
[[carbon_Glykou_etal_2021_input.xlsx]]
[[strontium_Glykou_etal_2021_input.xlsx]]
(no, these notes are not themselves spreadsheets, they are my notes describing the metadata of spreadsheets, each with am external link to the spreadsheets themselves, they just have the same name as their corresponding spreadsheet).
Does anyone know what is causing this weirdness so I can make it stop? It would be lovely if clicking the link to the note actually opened the note, instead of creating a new, empty note.
I have tried merging the new note with the real note, in hopes that it would update the link, but no, it still just makes a new note.
PS
I am not certain if this counts as a bug report (e.g. something wrong with Obsidian), or a request for help (e.g. it is something I did that causes this). Most of the “help” posts I have read seem to be of the sort “I can’t figure out how to…”, so I have gone with bug report for now. If it is better with the other tag, let me know, and I can change it back.

