Assertion error, no documentation is produced for standard Drupal core

Problem/Motivation

Visiting both /openapi/jsonapi?_format=json and /admin/config/services/openapi/redoc/jsonapi results in:
AssertionError: assert(is_a($target_resource_type, ResourceType::class)) in assert() (line 474 of modules/contrib/openapi_jsonapi/src/Plugin/openapi/OpenApiGenerator/JsonApiGenerator.php)

Steps to reproduce

core + jsonapi 10.0.9
openapi 8.x-2.1
schemata 1.0.0-beta3
openapi_ui + openapi_ui_redoc 8.x-1.0-rc4