Throw Error when the language is core

[yeying-xingchen]

Information:

• Prism version: latest
• Plugins: none
• Environment: Microsoft Edge 147.0.3912.86 x64

Description
Prism throws an error only when the language of a code block is set to core or a string beginning with core (e.g., core-deepseek).
Other invalid language names do not trigger any error.

Example
An example which reproduces the bug. This can be a link to a website, a JSFiddle, an attached example project, etc.

https://chat.deepseek.com/a/chat/s/c6c0de9e-cb3d-4fcb-88c2-af0266112221
You also can try it at:
https://chat.deepseek.com