Yes, this seems to be a bit inconsisten. I just tried it out with one Atmos and one DTS-X Movie.
UHD-BD Iso (with .Atmos. in the File Name) -> Displayed as 7.1 Atmos in Kodi (Skin: Rapier) -> The Container Dolby ThueHD is displaed in the PSE Sequemce Selector -> BUT: Atmos Bumper is played -> correct!
UHD-BD Iso (with .DTSX. in the File Name) -> Displayed as 7.1 DTS-X in Kodi (Skin: Rapier) -> The Container DTS-HD Master Audio is displayed in the PSE Sequemce Selector -> DTS-HD Master Audio Bumper is played -> incorrect!
PS: I need to add, that my comment above was based on PSE Version 0.1.1!
Need to check, if this has changed with 0.1.3.
....is there a smart way to update directly from the Add-on? Or do i need to remove the oudated version and Re-Install manually from USB??