Offscreen canvas example does not work in production mode

[MoonE]

Describe the bug
There seem to be different minifications for the projection class with the webworker and normal example code.
These two objects cannot be compared:

It's caused by the changes to the example webpack config in #12176

To Reproduce
Steps to reproduce the behavior:

1. Go to https://deploy-preview-12313--ol-site.netlify.app/examples/offscreen-canvas.html
2. See the failed assertion
3. Go to the previous stack frame, as in the picture above

Expected behavior
The projections compared here should be equivalent.

[tschaub]

I wonder if it would be enough to add a pattern for offscreen-canvas to the list of examples to exclude from minification.

[MoonE]

I'm also getting an error for the raster example. color-manipulation and region-growing seem to work.
Adding offscreen-canvas / offscreen-canvs\.worker to the regex doesn't work.