Don't know which branch is missing in jacoco report

I am writing Unit test for usecase in kotlin but don't know how to cover missing branch.

// ConnectFTPUseCaseImpl

// ConnectFTPUseCase
interface ConnectFTPUseCase {
    suspend fun connect(): Result<Unit>
}

class ConnectFTPUseCaseImpl @Inject constructor(
    @IoDispatcher dispatcher: CoroutineDispatcher,
    private val ftpRepository: FTPRepository,
): UseCase<Unit, Unit>(dispatcher), ConnectFTPUseCase {

    override suspend fun execute(parameters: Unit) {
        return ftpRepository.connectFTP()
    }

    override suspend fun connect(): Result<Unit> = invoke(Unit)
}

abstract class UseCase<in P, R>(private val coroutineDispatcher: CoroutineDispatcher) {

    suspend operator fun invoke(parameters: P): Result<R> {
        return runCatching {
            execute(parameters)
        }
    }

    @Throws(RuntimeException::class)
    protected abstract suspend fun execute(parameters: P): R
}

And I'm missing a branch like this. evd

I can cover 100% by calling execute directly like this:

class ConnectFTPUseCaseImpl @Inject constructor(
    @IoDispatcher dispatcher: CoroutineDispatcher,
    private val ftpRepository: FTPRepository,
): UseCase<Unit, Unit>(dispatcher), ConnectFTPUseCase {

    override suspend fun execute(parameters: Unit) {
        return ftpRepository.connectFTP()
    }

    override suspend fun connect(): Result<Unit> = runCatching {
        execute(Unit)
    }
}

I don't know what the cause is. Is there any way to cover this case without updating the code?