WPF Font Scaling Problem with Render Target Bitmap at Format1bppIndexed

I am using .Net framework 4.6.1 and faced following scaling problem in Arial Font.

Below image is generated with same program at DPI 96 for [100% windows 10 Scaling] and

DPI 120 for [125% recommended windows 10 Scaling]

In the result we can clearly see non homogeneity in rendering


I am also attaching project file,

You can experience same with program and executable (Its based on Arial Font)
Steps to reproduce:
Drag/move canvas elements on left and you will see Format1bppIndexed Image

image generated on left side.

All I want is to have homogeneous and smooth text rendering under different windows 10 scaling when rendering target bitmap @ Format1bppIndexed from WPF Element.

I am also attaching solution for reproducing,

scalingissuewpf.zip

_This issue has been moved from https://developercommunity.visualstudio.com/content/problem/449544/wpf-font-scaling-problem-with-render-target-bitmap.html
VSTS ticketId: 789260_
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