Specular Highlight Much Stonger/Larger In Forward Shading

In forward shading specular highlights appear to be much larger for very smooth materials in contrast to the deferred shader. In 4.14.3 the specular highlights were displaying correctly in forward shading. (See screenshot) Also know that I disabled bloom in the screenshot so you can better see the highlight.

REGRESSION?
Yes

Worked in Binary 4.14.3 CL 3249277
Broken in Binary 4.15.2 CL 3416026

1. Open a blank project
2. Create a new material
3. Put a scalar of 1 in base color and 0 in roughness > save and compile
4. Drag a simple sphere mesh into the default scene and apply the material
5. Enable forward shading in the project settings

RESULT
The specular highlight will be much larger and the bloom gets influenced much more as a result.

EXPECTED
The visual appearance isn't much different from deferred shading.