[BUG] 'IVRCSdkWorldBuilderApi' error on VRC SDK 3.10.3, cannot launch unity. PC, fresh project.

[micksam7]

Describe the bug
On a completely fresh project, Unity prompts to go into Safe Mode and spills out the error
Packages\com.mattshark.openflight\Editor\TagNotifier.cs(36,50): error CS0246: The type or namespace name 'IVRCSdkWorldBuilderApi' could not be found (are you missing a using directive or an assembly reference?)

To Reproduce
Steps to reproduce the behavior:

1. Start a new project
2. Include the latest non-beta SDK, 3.10.3
3. Include openflight

Expected behavior
Unity launches

Screenshots

Desktop (please complete the following information):

• OS: Windows 11
• VRC SDK Version: 3.10.3

Additional context
Works fine on SDK 3.10.2
Works fine on SDK 3.10.4-beta.3