从命令行时，XCTest找不到UICollectionViewCell

Question

I am running UI tests where I have a UICollectionView and I want to tap on the first UICollectionView cell.

When running my tests directly from Xcode : everything is OK.

When running my tests from command line (either with xcodebuild or fastlane and scan ) it fails.

I ended up with the following conclusion, by testing locally:

If simulator is launched and open : everything is OK

If simulator is not launched : The test to find the UICollectionViewCell fails (this is the case on most CI services)

Here is the executed testing code

let collectionView = app.collectionViews.element(boundBy: 0)
XCTAssertTrue(collectionView.waitForExistence(timeout: 5.0))

let firstCell = collectionView.children(matching: .cell).element(boundBy: 0)
XCTAssertTrue(firstCell.waitForExistence(timeout: 5.0))
firstCell.tap()

Which ends up in

Assertion Failure: <unknown>:0: No matches found for Find: Children matching type Cell from input {(
    CollectionView, 0x61400018fcb0, traits: 35192962023424
)}

Any help to make this test work while using fastlane (and xcodebuild) would be really appreciated.

Thanks