bug: IonRouterOutlet canGoBack() return always return false

# Bug Report

**Ionic version:**

[x] **4.6.1 / 4.6.2**

**Current behavior:**

ActivatedRoute canGoBack() always return false

**Expected behavior:**

canGoBack() should return correctly

**Steps to reproduce:**

**Related code:**

```
insert short code snippets here
```

**Other information:**

**Ionic info:**

```
insert the output from ionic info here
```