Square windows visible after Sharpen Standard; TPAI 2.1.2

Ran Sharpen Standard times on a jpg, ‘Subject only’, Save, and then Sharpen Standard, turning ‘Subject only’ off, Save. The windowing is visible on the subject on both outputs, but the windowing is more obvious on the ‘Subject only’ off version.
Sharpen Strong does the same thing. Lens and Motion Sharpen does not do this.
I’m using Windows version, TPAI 2.1.2.
DxDiag.txt (94.8 KB)

Steps to reproduce issue:

  1. Step 1
  2. Step 2
  3. Step 3

Topaz Photo AI [v2.1.2] on [Windows
2023-11-18-16-02-54.tzlog (26.9 KB)