When using the /gametest create command, e.g. /gametest create "TesT" 1 1 1, the structure block that is generated will have "test". This appears in the field where you input the structure that is to be saved/loaded/exported. It removes all uppercase characters, and replaces them with lowercase characters. This seems like unintended behavior to me, as structure files are indeed case-sensitive. The command block that is placed with it generates correctly, as it keeps the original string as name.

How to reproduce:

1. Input command /gametest create "TesT" 1 1 1.
2. Right-click on structure block that is generated.

Observed results:

Text in structure block is "test".

Expected results:

Text in structure block is "TesT".