If a report contains 2 prompts, one (e.g. Year prompt) is a standalone prompt, the other is nested in a filter (e.g. Year filter), the name of the nested prompt cannot be found in the lu_prompt table in Platform Analytics Warehouse.
The report looks like this:

The filter looks like this:

In the Platform Analytics warehouse, we can see the name of the standalone prompt, but not the prompt nested in the filter.

Create a standalone prompt and choose it in the filter.
This issue has been addressed in Strategy One March 2024.