File changes not automatically updated while using Jupyer notebooks

**Describe the bug**
Changes made to a file linked to a namespace are not automatically reflected in the workspace attached to a Jupyter notebook

**To Reproduce**
1. Start Jupyter notebook/lab
2. Create 2 notebooks
3. `]LINK.Create # app` in both notebooks
4. In one notebook:
```
Foo←{a}
]LINK.Add Foo
```
6. In the other notebook:
```
Foo
```

Returns:
```
VALUE ERROR: Undefined name: Foo
Foo
∧
```

But after `]LINK.Status` or `]LINK.Refresh # -source=dir`

```
{a}
```

**Expected behaviour**
The contents of `Foo` should be updated in the 2nd linked notebook

**Desktop (please complete the following information):**
Using dyalog-jupyter-notebook kernel from commit: [421dd512207daaf3aa62589839fac0edd9365c54](https://github.com/Dyalog/dyalog-jupyter-kernel/commit/421dd512207daaf3aa62589839fac0edd9365c54)

```
Dyalog 19.0.46960 64-bit Unicode, BuildID be73c399
OS Windows 10 or Windows Server 2016 (10.0.19044) 64-bit
Link 3.1.2
SALT 2.91
UCMD 2.51
.NET .NET Framework 4.8.4614.0
WS 19.0
```