`test_instance.description.dimension` displays as a raw translation key

The string test_instance.description.dimension, which appears in test instance blocks’ UI, is untranslated.

How to reproduce:

1. Execute the following command:

   /test run minecraft:always_pass

2. Open the menu of the test instance block that appears.
   -> ❌ The last line in the description box is untranslated.

Expected result:

The string test_instance.description.dimension would be translated.

Observed result:

The string test_instance.description.dimension is untranslated.