If you are looking for a 12.0.2 mail template fix or a new feature has been added, you can simply check the current versions and availability of changes and functionality. You can find more in this article where the updates will take place. It’s the same with version 12.0.1 mail templates.
For example:
Release Date: 2023-03-16
New Features:
Change history:
03/15/2023: Fixes for the following SPRs were added to English, German, Italian Mail template.
SPR # AYAVCP5END , SPR # SJOICJJGNB
Fixes
SPR # SJOICJJGNB >> Incorrect From address while replying to message when option “show display names as internet address” is enabled.
SPR # AYAVCP5END >> ‘invalid universal id’ and ‘No RESUME’ error seen on Reply/Reply All actions.