Does not recognize relationship values

This was a Chrome extension error that effected the UI

i also added a link to the view which cannot be selected

For a date I have a date field but it is also not seen

try with demo module it will work

Cannot install the Demo module.

There is not double_field:triple_field module.

There is this: https://www.drupal.org/project/triples_field →

Just to note for others.
the gantt_node.info.yml is wrong. It is not double_field:triples_field. It should be changed to triples_field:triples_field