Hi @TimPesce,
Thanks for clarifying this, I can reproduce the issue now. It seems that the conversion to the new editor format takes place regardless of whether the content is supported by the new editor. For example, I reproduced this with nested expand links:
I’ve raised [CONFCLOUD-71294] Updating a page transitions content to the new editor - Create and track feature requests for Atlassian products. to address this.
Regards,
Dugald