How to duplicate: Summon an entity (In my test I used an armor stand) with NoGravity on.
Although the armor stand isn't moving at all, and was also an invisible marker armor stand, bubble particles appeared as if it wasn't moving at all
This likely works as intended, but I just want to be sure
Surprisingly, the armor stand is actually drowning. The reason why the particles appear right away is because of MC-78527.