self xss – XSS Triggers only when pasted in

I have a XSS case that I would like to exploit as a proof of concept, however the payload seems to only be triggering when pasted in and not from the URL.

Basically, I have a search box which when pasting in the following XSS payloads triggers an alert.

<img src=x onerror=alert(1)>
<noscript><p title="</noscript><img src=x onerror=alert(1)>">

However, when clicking the search button and sending the GET request to /search?query=<payload> the payload doesn’t seem to be triggering.

Does anyone have any idea why or how I could get it to reflect from the URL? It seems quite weird that it only works immediately when pasted in but not after submitted.

UPDATE:

The following snippet is from the search results page source. The search term – aka payload in this scenario – is displayed as normal without any sanitizing but it is not executed.