Hello, this doesn't seem to be fixed in 1.16.4, when trying to summon a stationary water block in this fashion, the water block is still invisible unless provided with gravity in which case it'll re-appear when touching the ground:
/minecraft:summon armor_stand ~ ~ ~ {NoGravity:1b,Passengers:[{id:"minecraft:falling_block",BlockState:{Name:"minecraft:water",Properties:{level:"0"}},Time:1}]}
Portal Hub
Hello, this doesn't seem to be fixed in 1.16.4, when trying to summon a stationary water block in this fashion, the water block is still invisible unless provided with gravity in which case it'll re-appear when touching the ground: