Mouse not working on PlayStation

Temporary Fix / Workaround for PS4 Mouse Not Working (v1.21.81):

I had the same issue — the mouse stopped working completely after the 1.21.81 update on Minecraft PS4 Bedrock.

Here's what fixed it for me:

1. Unplug both the mouse and keyboard from the PS4.

2. Plug the mouse in first, using the first (main) USB port.

3. Then plug the keyboard in after.

4. Start Minecraft.

After doing this, the mouse started working again as normal!

It looks like the input order matters due to a bug introduced in recent updates. Hope this helps others until it's officially fixed