`writeFile` on Android Simulator will not overwrite an existing file, but write over it

I am using the `RNFS.writeFile(path, myObject, 'utf8');` method to write on a file specified by `path`. It works perfectly on iOS, but on Android Simulator it behaves strangely. When I use the command to write on a file that already exists, it will not completely overwrite the existing file, but it will write over it, keeping the existing content/string. The consequence is that if the existing file has a longer string than the string I am trying to write, the end of the string will be a broken thing, very weird.

I have tried to do `exists()` and `unlink()` in case the file exists before writing and it eliminates the bug. But the app becomes slower and if the user writes too fast I get some other annoying bugs because file does not exists when I try to read it.

Did anyone else had the same trouble as me?