The function instances() returns at least twice the number of instances

[spastorclovr]

Bug Report

1. Minimal reproduce step (Required)

https://play.kcl-lang.io/?s=M4YwFgpgtghgBADQE4BM4G0AeqD6BrASwDsUAaAcyQHsBXAB1JABsYCpgBeAMRieAgC6ALgBQccXBh0CANQhJgBKkSHAALkjgc4AIikEImNRCKLlwAHQhqwYHRZEIFpQHoAbgEYdYiYRKqNLV0AYSooOipFYwAlCGBaJBAIABEIADNiAjUlIm8JOCgINRgUGGKhOABvdSQApABfIMqffLgiGEKOHQASSuwUfGIUCyYqAHd5AAoASnqLXspaOnq8iXqWuDsIEArqjSFG7WbWiUX6ILO6Dfz2wuAm65O4PzRtfsGSR-F1uHWRNKCLCgACNSnB+lUfDoiFQ1GBiOQ4L01ABPOgQKhpSb9WbeP73bRYnBSOg4HEiETEuikiHaZAoSY6BDRACC1J0pF0JMs4FYpmKSAsxnAOmmkPyWxAFjc8jMpiC6C+4qeNw6ECCOk8vDoYBgXiVPwkAhEfxExHUMCISQJcCYJkm9Oc-Mt1pm0xEQA

• One Schema
• One Instance of this Schema

Related to #1880

2. What did you expect to see? (Required)

I expect to see that there is exactly 1 instance.

3. What did you see instead (Required)

Depending on whether I use the "_app_xrd" variable I wil get 1 instance (if used after creation) or
2 instances (if the variable is used before the actual creation of the variable _app_xrd)

While it does not seem like a "normal" use-case to use a variable before it is instanciated, it could happen when running kcl with multiple files as arguments
kcl file1.k file2.k

4. What is your KCL components version? (Required)

0.11.2