Unfortunately, stuff happens.
The library we use to get the Ethnologue codes stopped being updated on the version we are using for 8.0. Unfortunately, we don’t have a good upgrade path to getting 8.0 using the latest version of that library. We might be able to update with a fair amount of work, but it would be the Paratext product owner’s call on whether we do that.
9.0 is using the latest version of that library (and includes DWZ) and we should have a much better upgrade path going forward, so we will hopefully keep up with the changes to the Ethnologue in Paratext 9.0 (but no promises there, either).