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enumeratevthreads control whether or not virtual threads are included in list of threads returned by JDWP VirtualThread/AllThreads command.
trackvthreads controls which virtual threads will be returned when enumeratevthreads=y.
fakevthreadstartevent is independent of the two others. If y, then before sending an event, send a fake THREAD_START event for if the debugger hasn’t already been notified about the virtual thread that the event occurs on. Note currently there is a bug, and if trackvthreads=all, no fake THREAD_START will ever be sent. This is only an issue if the debug agent is started after some virtual threads have been created.

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