Mount Macro

As of pre-patch my Alt modifier in my mount macro stopped working. I searched the forums and found a few topics similar and did the “fixes” there but nothing has helped. The main fix that I thought would have worked was disabling “Self Cast Key”. But no.
Here is the Macro:

/use [nomounted,nocombat]Water Walking
/use [nomounted,nocombat]Path of Frost
/use [nomod]Zereth Overseer
/use [mod:alt]Sandstone Drake
/use [mod:shift]Grand Expedition Yak
/use [mod:shiftalt]Crimson Deathcharger
/dismount [mounted]

Everything works about it except the two lines with Alt modifier. Any suggestions?

/use [known:546,nomounted,nocombat] Water Walking
/use [known:3714,nomounted,nocombat] Path of Frost
/use [mod:shiftalt] Crimson Deathcharger; [mod:shift] Grand Expedition Yak; [mod:alt] Sandstone Drake; Zereth Overseer
/dismount [mounted]