Thread pool exhaustion exception during Dubbo 3.2.0-beta.4 startup only

When starting a Dubbo project using version 3.2.0-beta.4, a thread pool exhaustion exception is thrown. The error only occurs during startup and does not reappear once the application has started successfully. Expected: improved thread management during startup to prevent pool exhaustion or better error handling.

Start by reproducing startup with Dubbo 3.2.0-beta.4 and capture the thread pool exhaustion exception, including the startup configuration and stack trace. Trace the startup thread-pool usage and compare it with a successful run; done means startup no longer throws the exception or handles the exhaustion appropriately.

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