Unable to use ember-concurrency@5.x with ember-cli-code-coverage

[AddictedToBattlestar]

Running COVERAGE=true ember t or COVERAGE=true ember t -s while using ember-concurrency@5.x with ember-cli-code-coverage fails with the below error:

Error: Assertion Failed: It appears you're attempting to use the new task(async () => { ... }) syntax, but the async arrow task function you've provided is not being properly compiled by Babel.

I did not expect to encounter this error because the Babel transform that Ember Concurrency uses is applied.
If I downgrade ember-concurrency to 4.x, then I no longer see this issue.

A sample Ember application I created this morning that demonstrates the situation:
https://github.com/AddictedToBattlestar/concurrency-coverage-test/tree/issue-to-report

Because of this, I am now postponing upgrading ember-concurrency@5.x within my application. Please help. Thanks!

[francescoparra]

Same problem for me.

[machty]

I meant to comment here but accidentally commented on the PR; easier to just continue the conversation there if that's ok: #602 (comment)