Blender 2.91 Exact Boolean Problem

Is anyone else having problems with the new Exact Boolean solver? It fails to have any effect on my destination mesh more often than it works, switching to Fast always works changing, nothing else.

Blender 2.91.0 on Ubuntu 20.04.

Are all of your meshes closed volumes? If so and it doesn’t work, please report the problem as a bug with a simple sample file.

“Are all of your meshes closed volumes?”

Honestly, I couldn’t guarantee it. I’ll keep that in mind and see if a pattern emerges before bothering you chaps.