Why adb sync leads to boot failure while make snod works fine?

I am trying to build a custom rom in AOSP angler-debug (Nexus6p, 8.0).

Full build works fine.Then I change some code in framework/base/core/java/.. and run mmma framework/base to rebuild the framework.

Here is the problem :

When I use adb sync to update framework, it leads to boot failure:

"didn't find class "com.android.providers.settings.SettingsProvider on path: ...."
"No original dex files found for dex location /system/priv-app/SettingsProvider/SettingsProvider.apk"

When I use make snod and fastboot flashall to flash system image, the device can boot correctly and the modified code effects.

Question : Is there something different between these two commands?

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