Please see the pinned post: About the Vermintide 2 - Bugs Category to see what information to include in your report.
The bug for “cannot pickup grandma’s bones” needs to be re-opened. It’s still a bug. Platform XBOX One. Steps to re-produce. Jump to the hidden bones on the map (which is really hard to do). Put the reticule dot over the bones. No message displays to pick up the bones. There is just a white outline on the bones. Please fix this.