We are in the middle of upgrading to SDL Web 8.5 / DXA 1.8 / Java 1.8. In general our application is working, and most values are being passed properly. However, there are some values that are unexpectedly blank. They all seem to be collections of objects --for instance collections of links --and they all seem to be collections that are nested inside other collections. The code is the same as worked pre-upgrade.
Is this a known issue? If not, is there a recommended approach to debugging this issue? Is there a step we might have skipped that would cause an issue like this? (Please let me know if there are additional details that would be helpful.)