Samba server multichannel session setup regression?

[Steve French]

Mounting multichannel from Linux to Samba server on localhost
(even current master Version 4.22.0pre1-GIT-8edb1fd13c1 but I also see
it failing on Samba 4.21 - but it works fine on Samba 4.19.5 and has
worked for years)

I see many repeated:

[ 1936.825332] CIFS: Status code returned 0xc000000d STATUS_INVALID_PARAMETER
[ 1936.825344] CIFS: VFS: \\ Send error in SessSetup = -22
[ 1936.825353] CIFS: VFS: failed to open extra channel on
iface:0000:0000:0000:0000:0000:0000:0000:0001 rc=-22

trying to setup additional channels.  Any ideas what changed?

-- 
Thanks,

Steve