Why does the Boolean merge operation fail with two closed entities?

There are two closed entities here and the Boolean merge operation of the entities cannot be performed. May I ask, what is the problem?

Please export just the two objects and post the file here - there is no way to tell from an image.

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001.rar (5.8 MB)
002.3dm (94.5 KB)

Excuse me, what is the problem with the Boolean merge operation of my two model entities?

After splitting this model into separate entities, and then performing a Boolean merge with the main model, it will succeed!