@Nachum-Shmilovitz
I have never used Notepad++'s session snapshot and periodic backup feature, nor do I want Windows to decide when to install updates and restart my computer automatically (and took measures to stop it from doing so), so I have never encountered the problem of NUL char file corruption. That’s the reason why I’m not happy with the disablement of the NppSaveAsAdmin plugin, too.
My workaround is to patch the version info of the plugin’s DLL file to outwit Notepad++'s compatibility check in PluginsAdmin. This can be done with the small tool Resource Hacker. I set the version number from 1.0.211 to 1.0.212, so the plugin can be used again. After saving a file with the plugin Notepad++ shows an error dialog mentioning an invalid handle but nevertheless the file gets saved correctly.
The other option, patching Notepad++'s nppPluginList.dll file, doesn’t work because this file is signed. Any changes of this file prevents it from being loaded with Notepad++.