Unexpected Ambisonics format

When trying to load an ambisonics file using this project: https://github.com/robertncoomber/NativeiOSAmbisonicPlayback/

I get "Unexpected Ambisonics format".

Interestingly, loading a 3rd order ambisonics file works fine:

let ambisonicLayoutTag = kAudioChannelLayoutTag_HOA_ACN_SN3D | 16
let AmbisonicLayout = AVAudioChannelLayout(layoutTag: ambisonicLayoutTag)
let StereoLayout = AVAudioChannelLayout(layoutTag: kAudioChannelLayoutTag_Stereo)

So it's purely related to the kAudioChannelLayoutTag_Ambisonic_B_Format