Thanks for your reply.
The component created in cpp is attached to root component by default, as shown in the blueprint screenshot.
I initially attempted to manually attach the component to the root component in C++, but it didn’t work until I restarted the engine. . After rebooting, the component functions correctly even without manual attachment.
Unfortunately, I’m now unable to reproduce the issue now. While rebooting seems to resolve many problems, the underlying cause remains unclear.