Prefix option in config not working as expected

[H7ioo]

Describe the bug

Using extendTailwindMerge prefix option doesn't work as expected.

To Reproduce

https://codesandbox.io/p/devbox/summer-architecture-f4f8ld

import { extendTailwindMerge, twMerge } from "tailwind-merge";

(() => {
  const customTwMerge = extendTailwindMerge({ prefix: "plasmo-" });

  const className =
    "plasmo-text-3xl plasmo-text-4xl plasmo-text-sm text-3xl text-4xl text-sm";

  console.log("Default", twMerge(className));
  console.log("Custom", customTwMerge(className));

  /*

   Default plasmo-text-3xl plasmo-text-4xl plasmo-text-sm text-sm                                                                                                                                     
   Custom plasmo-text-3xl plasmo-text-4xl plasmo-text-sm text-3xl text-4xl text-sm                                                                                                           
  
*/

  const customTwMerge2 = extendTailwindMerge({ prefix: "tw-" });

  const className2 =
    "tw-text-3xl tw-text-4xl tw-text-sm text-3xl text-4xl text-sm";

  console.log("Default", twMerge(className2));
  console.log("Custom", customTwMerge2(className2));

  /*
 
 Default tw-text-3xl tw-text-4xl tw-text-sm text-sm                                                                                                                                                    
 Custom tw-text-3xl tw-text-4xl tw-text-sm text-3xl text-4xl text-sm 
  
*/
})();

Expected behavior

Expected behavior
Custom tw-text-3xl tw-text-4xl tw-text-sm text-3xl text-4xl text-sm

Environment

• tailwind-merge version: 3.0.1

Additional context

Edit 1:
This works on v2.6.0 but not on v3.0.0 and v3.0.1

Edit 2:
Prefix defined in config shouldn't include combining - character anymore by @dcastil in https://github.com/dcastil/tailwind-merge/pull/518
I tried removing the - still not working as expected

[H7ioo]

Sorry
Supports Tailwind v4.0 (if you use Tailwind v3, use [tailwind-merge v2.6.0](https://github.com/dcastil/tailwind-merge/tree/v2.6.0))

[dcastil]

Ah you already answered it! Keep in mind that you'll need to change the prefix to just plasmo when you upgrade to Tailwind CSS v4 and tailwind-merge v3.