[BUG] org.jetbrains.uast.UastUtils.findContaining() Unable to recognize Kotlin class in Kotlin multiplatform

Steps to reproduce

1. I have a project which has the following structure

It can be accessed from here https://github.com/user-attachments/files/15753275/kt-multiplatform-example.zip

2. Use the following code to access these two class elements.

String fileText = psiFile.getText();
int offset = fileText.contains("class") ? fileText.indexOf("class") : fileText.indexOf("record");
if (offset < 0) {
    Notifier.notifyWarn("Can't find class scope.", project);
    return;
}
PsiElement elementAt = psiFile.findElementAt(offset);
UElement uElement = UastUtils.findContaining(elementAt, UClass.class);

3. For all `.kt` files in folder `jvmMain`, function `org.jetbrains.uast.UastUtils.findContaining()` can find UElement. But for all `.kt` files in folder `commonMain`, this function will only return NULL.

They are all `.kt` files, have the same structure, and have a complete Kotlin environment, but why this the case?