MEDLINEPLUS: errors browsing ontology - Goo::Base::AttributeNotLoaded - Attribute children is not loaded for http://purl.bioontology.org/ontology/MEDLINEPLUS/C1456590

[alexskr]

We are seeing a high number of errors associated with browsing MEDLINEPLUS ontology:

UI:
https://bioportal.bioontology.org/ontologies/MEDLINEPLUS?p=classes&conceptid=C0001956 results in the error

API logs:

2024-07-24 18:08:28 - Goo::Base::AttributeNotLoaded - Attribute `children` is not loaded for http://purl.bioontology.org/ontology/MEDLINEPLUS/C1456590. Loaded attributes: #<Set: {:submission}>.:
	/srv/ontoportal/ontologies_api/shared/bundle/ruby/2.7.0/bundler/gems/goo-70007faf43d0/lib/goo/base/settings/settings.rb:283:in `block in shape_attribute'
	/srv/ontoportal/ontologies_api/shared/bundle/ruby/2.7.0/bundler/gems/ontologies_linked_data-013a322440b4/lib/ontologies_linked_data/models/class.rb:452:in `block in tree'
	/srv/ontoportal/ontologies_api/shared/bundle/ruby/2.7.0/bundler/gems/ontologies_linked_data-013a322440b4/lib/ontologies_linked_data/models/class.rb:450:in `each'
	/srv/ontoportal/ontologies_api/shared/bundle/ruby/2.7.0/bundler/gems/ontologies_linked_data-013a322440b4/lib/ontologies_linked_data/models/class.rb:450:in `tree'
	/srv/ontoportal/ontologies_api/releases/20240718174655/controllers/classes_controller.rb:133:in `block (2 levels) in <class:ClassesController>'

...

	/usr/local/rbenv/versions/2.7.8/bin/bundle:25:in `<main>'
123.123.123.123 - ncbobioportal [24/Jul/2024:18:08:28 -0700] "GET /ontologies/MEDLINEPLUS/classes/http%3A%2F%2Fpurl.bioontology.org%2Fontology%2FMEDLINEPLUS%2FC0001956/tree?include=prefLabel%2ChasChildren%2Cobsolete HTTP/1.0" 500 30 0.0997