If you run ElvUI and your skyride keys were doing nothing mid-flight, this is the one. The fix is simple in hindsight: EMS was pointing the skyride key at the default action slot, which ElvUI replaces and never routes. It now casts by ability name instead, so it fires correctly regardless of what bar addon you run.
Also in this release: EMS is now current for 12.0.7, so the out of date nag on the addon list is gone.
If you share a key between a sequence and a skyride action, that works too. Auto Dismount on handles dismounting and casting through your sequence, off just fires the ability directly.
Grab the update on CurseForge, Wago, or WoWInterface.