Lock Alpha Channel breaks Blend modes for Paint Bucket and Draw Shape rectangles

[DEF7]

What are you trying to do, and what do you expect to happen?

I'm trying to use the Paint Bucket and Draw Shape tools to blend a color onto a specific area of a texture, using a blending mode other than alpha-blending, while retaining the existing alpha channel of the texture.

What happens instead?

The Paint Bucket's fill modes "Face", "Element", and "Connected Elements" cause blend modes to not work at all if Lock Alpha Channel is enabled - instead behaving as though the Default blend mode is active.

Both of the rectangle shapes from the Shape Tool are also not blended using the selected blend mode when Lock Alpha Channel is enabled. The ellipse shapes blend as expected.

Model format in which the issue occurs

Generic Model

Blockbench variant

Program

Blockbench version

4.11.2

Operating System

Windows 10 LTSC

Installed Blockbench plugins

none