Historically, all particle images are stored in the textures/particle/ folder of a resource pack. The only exceptions to this are the recent trial_spawner_atlas.png particle file and its ominous counterpart, which are stored in textures/particles.

Other 1.21 particles such as gust are already in the correct folder.

Expected Result

trial_spawner_atlas.png and trial_spawner_ominous_atlas.png are stored in the textures/particle/ folder alongside the other 1.21 particles.

Observed Result

trial_spawner_atlas.png and trial_spawner_ominous_atlas.png are stored in the textures/particles/ folder, resulting in two separate particle-related folders in the 1.21.0 textures folder.

To Fix

Move trial_spawner_atlas.png and trial_spawner_ominous_atlas.png to the particle folder and remove the particles folder. The trial_spawner_detection.particle.json and trial_spawner_detection_ominous.particle.json files must also be updated to use the new filepaths.