BUG: Reference editor: Repeated search for same term returns different results

[lorenzulrich]

Current behaviour

• If I repeatedly search for the same term in the reference editor, I potentially get a different result set each time.

Expected behaviour

• The search for the same term always returns the same result.

Steps to reproduce

• I configured a reference from one node type to another
• In my video example, I'm searching for the term "Hund". There are exactly two matching items.

neos-ui-reference-search.mp4

• I enter "Hund" a first time.
• ✅ Two results are being displayed
• I delete the text and enter "Hund" a second time.
• 🐞 Four results are being displayed
• I delete the text and enter "Hund" a third time.
• 🐞 Even more results are being displayed
• I delete the text and enter "Hund" a fourth time.
• 🐞 Even more results are being displayed.
• I delete the text and enter "Hund" a fifth time.
• ✅ Two results are being displayed

What happens

• As you can see in the Network tools, for the first search, "Hund" is being sent to the API.
• The second request has "Hun" as a payload
• The third request has "Hu" as a payload
• The fourth request has "H" as a payload
• When I enter "Hund" the fifth time, somehow Neos realized that it already has results for "Hund" in the cache and returns the correct results.

I double-checked this in another installation and with longer words and it's always the same. Each time I manually re-enter the same term, one more character is trimmed from the end of the word until no character is left.

Environment

• Neos 8.3