Syncing the /ownCloud folder with another cloud service is indeed not supported. Both services manipulate the folder in some ways to do their thing and that will always collide somehow. In case of Google Drive it makes most sense to just include it as external storage into ownCloud.
The disappearence of files doens’t seem to be reproducable. Of course any way to make it reproducable would be appreciated and we would look after it in the client repo: https://github.com/owncloud/client
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