"CustomPotionEffects" Inoperable with Splash / lingering Potions

Quite simply, the "CustomPotionEffects" does not work in with splash potions (note "splash_potion" is the new ID for splash potions as default potions no longer rely on the "Damage" value to determine both the effect and regular vs splash):

/give @p splash_potion 1 0 {CustomPotionEffects:[{Id:14,Duration:600}]}

/summon ThrownPotion ~ ~1 ~ {Potion:{id:splash_potion,tag:{CustomPotionEffects:[{Id:14,Duration:600}]}}}

In comparison to regular potions, in which the effect is applied correctly:

/give @p potion 1 0 {CustomPotionEffects:[{Id:14,Duration:600}]}

For reference, the following is the new "Potion" format that shifts away from using "Damage" values. This is for default potion effects, not custom ones:

/give @p splash_potion 1 0 {Potion:"minecraft:strength"}