[BUG]The two png are mismatch, but always return a matched result.

[bonnie-shi]

Describe the bug
The two png are mismatch, but always return a matched result.

To Reproduce
Steps to reproduce the behavior:\

1. I use ImageComparison to compare png on my ci test case. most png compared result return rightly, but recently, i have two png always return matched. but infact they are diffrent.
2. see two png to compare.

Expected behavior
return MISMATCHED

Screenshots

Desktop (please complete the following information):

• OS: Windows
• Browser: chrome
  Actual
  

Baseline:

[bonnie-shi]

The two image is created by SVG convert to PNG.

[MikeMCrank]

Have you set tolerance and threshold values both to 0?