Link Parameters on Selects not working

Hello friends,
I have a problem that I can’t understand if it’s my fault or a bug.

Let’s say I have two forms. One is appointment and the second is Clients.
When I create a Link button in the appointments form I can select the primary key of Clients and pass parameters in order to edit the record.

If in appointments I create a select field to choose the client and inside the field options in paragraph “Lookup Settings” I choose “Create Link”, even if I follow the same steps, the primary key field isn’t displayed as parameter.

I tried several options with no success. Is it a bug or am I doing something wrong?

It’s definitely a bug.
In a select fields in linking, If you select to create a link, you don’t have the option to link to an app with field reference.
The only available options are “Variable”, “Fixed Value” and “No Value”. The option “Fields” disappeared after previous update.
If you choose Button Link then the Field option is still available.