I've just downloaded the APK from the last release, and it lacks the value for versionCode:

package: name='org.projectbuendia.client.dev' versionCode='' versionName='7af6a39' platformBuildVersionName='7af6a39'

As versionCode is what Android uses to tell versions apart (and to decide which is newer), this is an important technical detail. Could you please ensure it is set? And while on it, the commit hash is a bad idea for versionName – which is intended to be human-readable, so humans can tell versions apart; especially for non-techies it is hard to tell which hash is newer, so while on it, could you "sync" that with the tag name?

Thanks in advance!