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This issue is not related to gradle? but maybe plugin what you're using to parse yaml file

@Chi Cuong Le it was not observed with 5.x and 6.x versions of gradle.

Okey. That is integration issue between plugin and Gradle version. I'm sure that I had have to update different plugins because of new policy of Gradle 7. Can be that your plugin still use old methods to access files, this method is no more allowed in new Gradle. In conclusion: you have to upgrade your plugins too, or post in plugins repository to get some help

This is resolved after modifying the path specified in $ref. I think the way the new plugin handles references from external files has changed. https://davidgarcia.dev/posts/how-to-split-open-api-spec-into-multiple-files/