I am glad you figured this out! Apologies for not seeing this right away. Our system looks for threads with only one post, but since you replied to your own post, our system did not pick this up for a reply. Our apologies and we will look for ways to improve this.
As mentioned by @Jonathan_Champ if you do not include an action, we will default to “disassociate.” This can be seen on the right-hand side of the docs as seen below.
If there are defaults for query params or other fields, they will always be in the validations section of that field. Please keep that in mind as it will mitigate these issues in the future.
If you have any questions, please let me know.