The purpose of sideload mode is to use your device without any connected accounts, so it's possible that this is intended behaviour, i.e. you can't use sideload mode and Google Drive at the same time, because Google Drive requires an account. The removal of sideload mode when you sync may therefore be deliberate. If you don't configure Google Drive, you should be able to sync dictionaries and firmware updates without having sideload mode get disabled.
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