Hi, I think some change in the path finding logic or mob ai broke the compatibility with the Horde mod.

Changed mod Version: 0.14 (from Git)
the Hordes mod Version: 1.2.3

How to Replicate:

1. launch the game with the mods once and go to "${YOUR_MC_FOLDER}\config\hordes\data\hordes\tables" and create a file called "changed_all.json"

and paste the following
[ "changed:light_latex_wolf_female-10-0-0", "changed:light_latex_wolf_male-10-0-0", "changed:light_latex_wolf_organic-10-0-0", "changed:light_latex_knight-10-0-0", "changed:light_latex_centaur-10-0-0", "changed:headless_knight-10-0-0", "changed:light_latex_knight_fusion-10-0-0", "changed:latex_crystal_wolf-10-0-0", "changed:latex_crystal_wolf_horned-10-0-0", "changed:latex_deer-10-0-0", "changed:latex_bee-10-0-0", "changed:latex_pink_deer-10-0-0", "changed:latex_keon_wolf-10-0-0", "changed:aerosol_latex_wolf-10-0-0", "changed:dark_latex_dragon-10-0-0", "changed:dark_latex_wolf_male-10-0-0", "changed:dark_latex_wolf_female-10-0-0", "changed:dark_latex_pup-10-0-0", "changed:dark_latex_yufeng-10-0-0", "changed:latex_beifeng-10-0-0", "changed:latex_benign_wolf-10-0-0", "changed:latex_blue_dragon-10-0-0", "changed:latex_blue_wolf-10-0-0", "changed:latex_crocodile-10-0-0", "changed:latex_fennec_fox-10-0-0", "changed:latex_hypno_cat-10-0-0", "changed:latex_leaf-10-0-0", "changed:latex_squirrel-10-0-0", "changed:latex_manta_ray_female-10-0-0", "changed:latex_manta_ray_male-10-0-0", "changed:latex_medusa_cat-10-0-0", "changed:latex_mermaid_shark-10-0-0", "changed:latex_moth-10-0-0", "changed:latex_siren-10-0-0", "changed:latex_snake-10-0-0", "changed:latex_mimic_plant-10-0-0", "changed:latex_pink_wyvern-10-0-0", "changed:latex_pink_yuin_dragon-10-0-0", "changed:latex_purple_fox-10-0-0", "changed:latex_raccoon-10-0-0", "changed:latex_red_dragon-10-0-0", "changed:latex_red_panda-10-0-0", "changed:latex_shark-10-0-0", "changed:latex_shark_male-10-0-0", "changed:latex_shark_female-10-0-0", "changed:latex_sniper_dog-10-0-0", "changed:latex_alien-10-0-0", "changed:latex_snow_leopard_male-10-0-0", "changed:latex_snow_leopard_female-10-0-0", "changed:latex_squid_dog_female-10-0-0", "changed:latex_squid_dog_male-10-0-0", "changed:latex_stiger-10-0-0", "changed:latex_tiger_shark-10-0-0", "changed:latex_traffic_cone_dragon-10-0-0", "changed:latex_translucent_lizard-10-0-0", "changed:latex_orca-10-0-0", "changed:latex_otter-10-0-0", "changed:latex_watermelon_cat-10-0-0", "changed:latex_white_tiger-10-0-0", "changed:latex_yuin-10-0-0", "changed:milk_pudding-10-0-0", "changed:shark-10-0-0", "changed:white_latex_wolf-10-0-0", "changed:phage_latex_wolf_female-10-0-0", "changed:phage_latex_wolf_male-10-0-0" ]

2. then go to "${YOUR_MC_FOLDER}\config\hordes\data\hordes\horde_scripts", create a file called "changed.json" and paste the following:

{ "function": "hordes:set_spawntable", "value": [ "hordes:changed_all" ], "conditions": [] }
3. in game, type "/spawnHordeWave @p 1 hordes:changed_all" to summon 1 wave; then you will find all spawned changed entities will freeze in place (still attacks if you come into their vicinity)

This is likely related to the attribute change. Where the movement speed was mapped 1.0 -> 0.1 to match the player.

Thank you so much!

After review the hordes mod's source code, I have found that entity speed can be configured by the datapack creator. There is a spawndata function that will set the entity's speed in a horde. The Changed entities will need to be configured with a speed of 10.0, instead of 1.0.
Modified example provided by the wiki:

{
	"function": "hordes:set_entity_speed",
	"value": 10.0,
	"conditions": []
}