Geyser particle only goes up

Issue: minecraft:geyser particle (and variants _base, _blume, _poof) cannot be given negative vertical motion via delta values

I've been using the geyser particle for pipeline/steampunk builds via /particle, since it produces a better visual result than other steam/smoke particle options. However, it appears the particle's motion is hardcoded to travel upward regardless of the delta values passed.

Example command:

/particle minecraft:geyser{water_blocks:1} ~ ~ ~ 1 -1 1 0.5 0 force

Even with a negative Y delta (-1), the particles still rise instead of falling. This seems to be a property baked into the particle's behavior rather than something controlled by the delta parameters (which normally define the random spread/velocity range for the particle spawn).

This limits use cases requiring downward particle flow (e.g., overhead pipe venting, downward drips, top-mounted exhausts) without switching to a visually inferior alternative (smoke, campfire_cosmic_smoke, dripping_* variants, etc.).

If anyone knows a fix I would be happy to know!