Search broken on "Submit a new album" page

[andreoda]

Website

VocaDB

Describe the bug

On the submit page for albums, the "search for duplicates" system does not seem to work in some cases. Specific case with the album name "恋​は​り​ん​り​ん"​.

To Reproduce

Steps to reproduce the behavior:

1. Go to https://vocadb.net/Album/Create
2. Type in "恋​は​り​ん​り​ん​"
3. See no duplicates being found

Expected behavior

Normally, it should reveal that there are already albums with that name.

• https://vocadb.net/Al/33659
• https://vocadb.net/Al/41728

Screenshots

Desktop

• OS: Windows
• Browser: Firefox

Additional context

The normal search gives the proper results: https://vocadb.net/Search?filter=%E6%81%8B%E2%80%8B%E3%81%AF%E2%80%8B%E3%82%8A%E2%80%8B%E3%82%93%E2%80%8B%E3%82%8A%E2%80%8B%E3%82%93%E2%80%8B&searchType=Album

[Shiroizu]

The FindDuplicate -API (see the browser/network-tab) only searches for exact matches.

"恋​は​り​ん​り​ん​" does not correspond to any album titles: https://vocadb.net/Search?searchType=Album&filter="恋%E2%80%8Bは%E2%80%8Bり%E2%80%8Bん%E2%80%8Bり%E2%80%8Bん"

The form works as intended when the whole title is inputted: "恋​は​り​ん​り​ん​／​浮​か​ぶ​ハ​ン​バ​ー​ガ​ー"

[Shiroizu]

Additionally, the example string seems to contain ZWSP-characters: https://en.wikipedia.org/wiki/Zero-width_space

(Notepad++ --> View --> Show Symbol --> Show All Characters)

This probably caused the initial confusion as these characters make the strings different even though they look the same.