This does not relate to the command being executed at high frequency, the TP command is ran once and once only.
Reproduction:
Summon this entity block in a command block using this command:
/summon AreaEffectCloud ~ ~1.125 ~ {Radius:0.5f,Duration:2147483647,Effects:[],Particle:"take",Tags:["Block","BlockController"],Passengers:[{id:"Shulker",Invulnerable:1,NoAI:1,Tags:["Block"]},{id:"FallingSand",Block:"minecraft:stone",Time:1,Tags:["Block"]}]}
Now run this ONCE:
/tp @e[tag=BlockController] ~ ~1 ~
Nothing happens?
The teleport will only update after quitting and rejoining
Code analysis by @unknown can be found in this comment.
Linked issues
Comments 20
It's not being ignored. Assignment is no indication of this, only a very low percentage of fixed issues are assigned before fixing them.
Combining with MC-44654; it's the same issue.
@@unknown, this report has been resolved as duplicate of MC-44654. Please comment on that report in the future.
Confirmed, as you said, this is NOT related to MC-81075 because the commands don't have to be executed on the same tick. This bug seem to only affect AreaEffectCloud. Here is a cleaned command for better testing: