Hi there,
Sorry that the Dissolve filter in Photoshop is not working as expected.
Which version of Photoshop are you using and what is your computer's OS?
Would you mind sharing your editing workflow in Photoshop? Are you facing this issue while working with a specific file or file format?
To get started, you may checkout the steps mentioned here: https://helpx.adobe.com/lightroom-classic/kb/lightroom-basic-troubleshooting-fix-most-issues.html
Let us know the outcome.
Thanks,
Akash