Versions:

"ember-cli": "~4.12.1",
"@embroider/compat": "^3.2.1",
"@embroider/core": "^3.2.1",
"@embroider/webpack": "^3.1.5",
"ember-cli-code-coverage": "2.0.0"

Utilizing embroider >2 (as of writing, 3.2) coverage is not generated.

From initial debugging, a couple things ive noticed:

• The stableWorkspaceDir (@embroider/compat) method returns a directory that does not match the build directory that is printed when the build completes before tests are run (Built in ....) -- Unsure if this is actually an issue, or Istanbul simply needs an empty directory to work from
• testMiddleware method is registered, but the app never POSTs back (coverageHandler is never invoked)
• If running with --server flag, sendCoverage is invoked, but window.__coverage__ is empty

Repro: https://github.com/chrismllr/repro-code-coverage-embroider