I am unable to reproduce the error as of right now. My feed depends on an external system, so it could be that that was the problem. Sorry for the confusion.
Can't set sync to 10 or 5 minutes
Setting sync to 10 or 5 doesn’t stick. 15 and greater works fine. Experimentation indicates that the sync interval of 5 or 10 is not silently respected in the refresh rate.
Indeed. Android doesn’t allow that for battery saving reasons.
We had to remove 5 and 10 minutes as options because in recent Android versions 15 minutes is the fastest sync interval which is allowed by the system.