danherrero → made their first commit to this issue’s fork.
I was running into this issue too. However, I tracked it down to an existing issue with the Node Edit Protection Module: https://www.drupal.org/project/node_edit_protection/issues/3455823 🐛 Fix the warning issue that occurs when pressing the save submit button in the Gin Admin theme RTBC
I tested with a clean Drupal install (10.3.1) and only Gin Theme @ 8.x-3.0-rc13 installed. No issues occurred which led me to explore other modules installed on the problem site.
Found the corresponding issue linked above and tested the patch on that issue which resolved things for me.
I ran into this issue as well. I found that the issue stems from a difference in the name_list_format links defined in the Name List Format configuration entity class and the name.routing.yml.
The attached patch resolves this.