How to reproduce:
1. Open the attached “DecalBug.zip” project
2. Open the “SampleScene” Scene
3. In the Hierarchy select GameObject “Decal Projector”

Expected result: In the Scene window Transform Gizmos for GameObject “Decal Projector” are visible
Actual result: In the Scene window Transform Gizmos for GameObject “Decal Projector” are not visible

Reproducible with: 12.1.0 (2021.2.1f1), 13.1.0 (2022.1.0a13)
Not reproducible with: 12.0.0 (2021.2.0b1), 12.1.0 (2021.2.0f1), 13.0.0 (2022.1.0a12)
Could not test with: versions lower than 12.0.0 (2021.2.0b1) (Decal Projector was added in 2021.2.0b1 and above)

Notes:
- To see the expected result select GameObject “Cube” from the Hierarchy