Describe the bug
After adding a set strip block to a new project, the neopixel blocks lose the default variable.

To Reproduce
Steps to reproduce the behavior:

1. Create a new project
2. Add Neopixel extension
3. Drag set strip block into workspace
4. Reopen toolbox
5. See error

Expected behavior
Default variables are included as before

Screenshots

micro:bit version (please complete the following information):
not hardware related

Desktop (please complete the following information):

• OS: [e.g. iOS] Windows 10
• Browser [e.g. chrome, safari] Chrome
• Version [e.g. 22] 136