perldebug 5.8.9 "Calling the debugger" lists -dt, but perldebug 5.8.8 doesn't even have that section -- though that may relate more to perl589delta "Changes to Existing Documentation" than that being when the -dt feature was added. But that means that "experimental feature" goes back at least as far as 5.8.9.

In reply to Re^2: Thread::Queue dies in debugger, runs without debugger by pryrt
in thread Thread::Queue dies in debugger, runs without debugger (solved) by yulivee07

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