I started experiencing this recently. I have all autosave-like settings disabled. But whenever I type letters like "E" or "T", the console shows "Writing file" and all post-save hooks kick in (like trimming white spaces, or parsing a config file).
You can see this in action in the screenshot below. I started modifying the value of a setting, the file got randomly saved and the config parsing triggered. The interesting thing is that the tab keeps showing the file as un-saved.
This is happening in both the nightly build and stable build. I have also disabled the Git package "save_first" logic.