External user not able to access shared dataset anymore

I recently tried to share a dataset with an eternal user. I already did it succesfully with another user before, so I knew what I needed to do.

1. I added the user to AD;
2. I ticked the option to share with external user from the dataset settings;
3. I shared the dataset (with build permission);
4. I told the external user to activate the preview function to access external shared datasets in power BI desktop.

The end result was that the external user is able to access and build report from the dataset in power BI service.

On the other hand, in Power BI desktop they see the "external data" tab in get data->PBI datasets but they see no dataset.

I tried on my external test account and it did work, but only until I updated Power BI desktop to the last version. Then I got a blank external data as well.

Did the last update break something? Or there are other options to tick? All the documentation I can find is from March.