[vim/vim] vim9: try to find a variable while want a function for an 'autoloaded' file (Issue #20911)

mao-yining created an issue (vim/vim#20911)

### Steps to reproduce

`b.vim`:

```vim
vim9script
export def F()
enddef
```
`a.vim`:

```vim
vim9script
import autoload "./b.vim"
def F()
	var A: func = b.F
enddef
F()
```

DON'T PUT THESE FILES UNDER `autoload/`!

source `a.vim`, then throw `E121`.

### Expected behaviour

No error

### Version of Vim

9.2.0888

### Environment

MS-Windows

### Logs and stack traces

```shell

```

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