Test fails: "expected to eventually be true, got <true>"

Nimble: 5.1.0, xcode: 8.0 (8A218a), using cocoapods, UI Testing bundle, iOS simulator (iPad 2 Air)

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Observed behaviour: Tests sometimes fail with the following message: "expected to eventually be true, got ". When rerunning the same test it often just passes.

Expected behaviour: When expectations gets true using the matcher beTrue() it should not fail.

Steps to reproduce:

• I haven't been able to consistently reproduce. The same tests sometimes fail with this message and sometimes don't. It happens in different test classes.
• The code is always of the following form: expect(myFunc()).toEventually(beTrue(), timeout: myTimeout) where myFunc() is in a different helper class.
• The same happens with the beTruthy() matcher.

Screenshot from Xcode