Even if I uninstall the app, the return value of getCurrentUser () of Firebase Auth does not become null, so I am in trouble, so I will record the solution here.
After investigating, this problem seems to be due to the automatic backup function of android. I solved it by turning off this feature from the manifest. Specifically, I added the following code to manifest.xml.
manifest.xml
<application
android:allowBackup="false"
android:fullBackupContent="false"
...
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