AddUserToRecordTeamRequest adds user to 2 access teams

Good Morning,

I'm using the AddUserToRecordTeamRequest message to add a user to an accounts access team, there are 2 Access teams on account, one which provides read only access and another that provides read/write access.

The AddUserToRecordTeamRequest seems to add my user to both teams however, despite referencing the read-only access team by ID?

What's going on?

Cheers,

John