Odd Behavior with @-ms-keyframes

[morphosic]

Installed product versions

• Visual Studio: Enterprise 2017 15.6.7
• This extension: 1.11.326

Description

Classes that contained the @-ms-keyframes are now within @-ms-keyframes.

Steps to recreate

1. Place @-ms-keyframes and contained rules inside a class.
   .delete-this {
   @-ms-keyframes wiggle {
   0% { -ms-transform: rotate(3deg); }
   50% { -ms-transform: rotate(-3deg); }
   100% { -ms-transform: rotate(3deg); }
   }
   }

2. Compile with web compiler

Current behavior

Classes that contained the @-ms-keyframes are now within @-ms-keyframes. I believe @Keyframes are only allowed "From", "To" and/or [percentage]. See attached images.

Base Code:

Compiled Code:

Expected behavior

The classes should be outside not inside.