Game test exporting does not function when enabled

In previous versions of Java Edition, the export tool for Game Tests worked perfectly (SNBT files were exported to the “Minecraft.Server” directory). However, in the latest version, the feature is non-functional. Attempting to use the “Export Structure” button in Test Instance Blocks or the export sub-commands in “/test” results in an error message claiming that test structure exporting is “disabled”. When I looked at the code, I discovered that the value required for the feature to work is set to “null”. As a result, the export tool is completely broken.

To reproduce this, enable the export functionality for game tests. When you attempt to export a structure using a Test Instance Block or the export sub-commands in “/test”, the game will print this error message: “Test structure exporting is disabled”.