compose-destinations: Getting IllegalDestinationsSetup: NavGraph 'RootNavGraph' doesn't have any start route

I’m getting IllegalDestinationsSetup: NavGraph 'RootNavGraph' doesn't have any start route. Use corresponding annotation with start = true in the Destination or nested NavGraph you want to be the start of this graph!

Version: 1.6.15-beta

Context: I have a multi-module setup and I’m using my own @CustomNavGraphs, so no @Destination uses @RootNavGraph

Workaround: Adding a

@Composable
@RootNavGraph(start = true)
@Destination()
fun Empty() {
}

seems to fix the false compilation error

Full stack-trace:

[ksp] com.ramcosta.composedestinations.codegen.commons.IllegalDestinationsSetup: NavGraph 'RootNavGraph' doesn't have any start route. Use corresponding annotation with `start = true` in the Destination or nested NavGraph you want to be the start of this graph!
	at com.ramcosta.composedestinations.codegen.commons.ModuleOutputUtilsKt.startingDestination(ModuleOutputUtils.kt:40)
	at com.ramcosta.composedestinations.codegen.writers.sub.NavGraphsSingleObjectWriter.write(NavGraphsSingleObjectWriter.kt:55)
	at com.ramcosta.composedestinations.codegen.writers.ModuleOutputWriter.write(ModuleOutputWriter.kt:39)
	at com.ramcosta.composedestinations.codegen.CodeGenerator.generate(CodeGenerator.kt:43)
	at com.ramcosta.composedestinations.ksp.processors.Processor.process(Processor.kt:48)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension$doAnalysis$4$1.invoke(KotlinSymbolProcessingExtension.kt:237)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension$doAnalysis$4$1.invoke(KotlinSymbolProcessingExtension.kt:235)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension.handleException(KotlinSymbolProcessingExtension.kt:330)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension.doAnalysis(KotlinSymbolProcessingExtension.kt:235)
	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:123)
	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:99)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:264)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:55)
	at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.kt:115)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.kt:255)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:101)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli$default(KotlinToJVMBytecodeCompiler.kt:60)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:157)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:52)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:94)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:43)
	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1642)
	at jdk.internal.reflect.GeneratedMethodAccessor105.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:359)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:562)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:796)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:677)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:676)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)