Custom Mouse Cursor not showing in WebGL build

I have a custom mouse cursor, set by default in the Player Settings, and then swapped with another custom cursor using a script when the player clicks. In IDE it works perfectly.

When I build for WebGL, or use Cloud Build, the default arrow shows up - no custom cursor.

I have the cursor textures set to Texture Type = Cursor, and Read/Write enabled.

Why is the cursor not showing up in a build?

I found this issue in the Issue Tracker:

Can anyone confirm that it’s fixed?

Submitted as a bug to Unity, it was reproduced and submitted to Unity developers.

Some solution??