Hololens 2 Holograms not persisting despite using World Locking Tools

Question

I am attempting to create an app that has holograms that persist in their location and size between app and device sessions. I have MRTK and WLT installed and configured in my scene. However, when I move holograms in my app, they do not persist between sessions.

Spatial Anchors and world mapping do persist through sessions, as well as hologram start locations, however, any adjustment to these holograms, or any holograms I spawn in during runtime, do not.

I have confirmed that the frozenWorldState.hkfw is saving every ~10 seconds and that the default settings are enabled. I have tried with just object manipulation scripts, as well as using spatial pins to no avail.

I have also tried loading up the sample SpacePin scene and building with that. It also has the same problems described as above (default hologram location, no persistence of holograms, the persistence of world anchors, and start location).

Am I misunderstanding what WLTs does at its core? Are holograms only going to persist from their starting locations? Am I potentially doing something wrong?

I am using Unity 2020.3.46, MRTK 2.8.3, WLT 1.5.9, OpenXR 1.7.0