How to do:

• Start a new project
• Create a new variable named "a" for this sprite only
• Hide variable "a"
• Duplicate "Sprite1" to "Sprite2"
• Rename variable "a" to "b"
• Place a "when flag clicked show variable b" on "Sprite2"
• Navigate to "Sprite1" or "Stage"
• Click on the flag
  The result: (rename .zip to .sb3)
  show variable for this sprite only bug.zip
  i used turbowarp.org, a fork of scratch