Debug is set to hot boot, and has been set to Update classes and resourcess,. Why doesn't it work?

problem description

configure hot startup in "Run/Debug configurations" of IDEA. Why do I set on update action to Update classes and resourcess, and not hot load when there is a update action? However, on frame deactivation can be hot loaded when set to Update classes and resourcess.

the platform version of the problem and what methods you have tried

IDEA version: 2018.1.5 UltimateEdition
I have been searching the Internet for a long time, and there is no answer to this question, so there is no relevant answer.

related codes

what result do you expect? What is the error message actually seen?

I hope to solve the problem and understand why.

Mar.25,2021

1, select war in the form of exploded
clipboard.png
2
Update classes and resourcess
clipboard.png

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