Reproduction steps:
1. Open new 3D Template Unity Project and scene "SampleScene"
2. In Hierarchy window, add new "Cube" GameObject
3. Save the scene
4. Select File -> Save As Scene Template
5. In File Explorer window, change "File name" to "RenamedTemplate" and save the Scene Template
6. In Project Browser window, observe the newly created Asset

Expected result: The asset name is "RenamedTemplate.scenetemplate"
Actual result: The asset name is "SampleScene.scenetemplate"

Reproducible with: 2020.3.24f1, 2021.2.5f1, 2022.1.0b1
Could not test with: 2019.4.33f1 (Scene Templates not available)

Notes:
1. Renaming the Scene Template Assets manually after the initial failure fixes the issue
2. The issue reproduces with any form of Scene Template, whether its created off "SampleScene", "Basic (Built-in)" or "Empty"