References belong to incorrect node.

Describe the bug

As you can see, case <- Change Statement is in main.go, however, the Reference tree show that the statement belongs to log.go, which is wrong.

Steps to reproduce

1. create a simple golang project
2. create log.go, which contains:

package main

func log(msg string) {
	Change <- true
}

3. create main.go, which contains:

package main

var Change chan bool
func main() {
	select {
	case <-Change:
		// do something
	}
}

4. put cursor to Change variable, and call lspsaga reference function

Expected behavior

case <- Change Statement is belongs to log.go in reference tree.

Neovim version (nvim -v)

NVIM v0.9.5 Build type: Release

lspsaga commit

2198c07

Terminal name/version

tmux 3.3a

Reproduce the reference lookup with the two-file Go project described in the issue, using the lspsaga reference function on Change. Trace how the reference tree assigns the select case between main.go and log.go. Done means the tree attributes each reference to the file containing it, including the case <- Change statement in main.go.