The Read/Write Masks properties can be used to hide/lock a specific part of an image and are not related to your issue.
It turns out that I forgot to add something to the PreserveColorType method. And I also had to fix something in my unit test that should have detected this. In the next version of Magick.NET 7.0.0.104 your issue will be resolved.
It turns out that I forgot to add something to the PreserveColorType method. And I also had to fix something in my unit test that should have detected this. In the next version of Magick.NET 7.0.0.104 your issue will be resolved.