Debug shows nginx try_files ignores a file that actually exists - nginx

Question

I'm trying to build a location block that serves files from the /tmp directory, but only ones that do not end with a .txt extension.
For now I have this :
location ~^\/temporary(?!.*\.txt$)(.*)$ {
root /tmp;
try_files $1 =404;
}
The problem is I only get 404s, even though the file I'm asking for exists. I used a little debug to make sure of that, here's the debug dump for the "/temporary/test.html" URI:
022/07/17 19:53:42 [debug] 6408#0: *1 http script capture: "/test.html"
2022/07/17 19:53:42 [debug] 6408#0: *1 trying to use file: "/test.html" "/tmp/test.html"
2022/07/17 19:53:42 [debug] 6408#0: *1 trying to use file: "=404" "/tmp=404"
2022/07/17 19:53:42 [debug] 6408#0: *1 http finalize request: 404, "/temporary/test.html?" a:1, c:1
2022/07/17 19:53:42 [debug] 6408#0: *1 http special response: 404, "/temporary/test.html?"
2022/07/17 19:53:42 [debug] 6408#0: *1 http set discard body
2022/07/17 19:53:42 [debug] 6408#0: *1 HTTP/1.1 404 Not Found
As you can see the server actually tried to read the /tmp/test.html file, so the path crafting has worked.
Also the file exists and is readable as shown with this command :
sudo -u nobody stat /tmp/test.html
File: /tmp/test.html
Size: 15 Blocks: 8 IO Block: 4096 regular file
Device: 803h/2051d Inode: 2097220 Links: 1
Access: (0664/-rw-rw-r--) Uid: ( 1000/ nobody) Gid: ( 1000/ user)
Access: 2022-07-17 19:26:19.701542983 +0300
Modify: 2022-07-17 19:53:17.923305174 +0300
Change: 2022-07-17 19:53:17.923305174 +0300
Birth: 2022-07-17 19:26:19.701542983 +0300
What am I missing ?

Answer 1

Okay so apparently the /tmp directory was the origin of the problem. When I tried another directory everything worked as expected for some reason.