All interactions with horses (riding, shift-clicking, etc) result in a crash to launcher.

Error below:
java.lang.NoSuchFieldError: Class net.minecraft.class_1269 does not have member field 'net.minecraft.class_1269 field_5811'
at knot//dev.gallon.fabric.HorseStatsModFabric.lambda$onInitializeClient$2(HorseStatsModFabric.java:52)
at knot//net.fabricmc.fabric.api.event.player.UseEntityCallback.lambda$static$0(UseEntityCallback.java:57)
at knot//net.minecraft.class_310.handler$zdc000$fabric-events-interaction-v0$injectUseEntityCallback(class_310.java:3772)
at knot//net.minecraft.class_310.method_1583(class_310.java:1759)
at knot//net.minecraft.class_310.method_1508(class_310.java:2048)
at knot//net.minecraft.class_310.method_1574(class_310.java:1870)
at knot//net.minecraft.class_310.method_1523(class_310.java:1313)
at knot//net.minecraft.class_310.method_1514(class_310.java:933)
at knot//net.minecraft.client.main.Main.main(Main.java:265)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)

-- Head --
Thread: Render thread
Stacktrace:
at knot//dev.gallon.fabric.HorseStatsModFabric.lambda$onInitializeClient$2(HorseStatsModFabric.java:52)
at knot//net.fabricmc.fabric.api.event.player.UseEntityCallback.lambda$static$0(UseEntityCallback.java:57)
at knot//net.minecraft.class_310.handler$zdc000$fabric-events-interaction-v0$injectUseEntityCallback(class_310.java:3772)
at knot//net.minecraft.class_310.method_1583(class_310.java:1759)
at knot//net.minecraft.class_310.method_1508(class_310.java:2048)

-- Uptime --
Details:
JVM uptime: 46.401s
Wall uptime: 37.736s
High-res time: 36.685s
Client ticks: 683 ticks / 34.150s
Stacktrace:
at knot//net.minecraft.class_310.method_1587(class_310.java:2443)
at knot//net.minecraft.class_310.method_54580(class_310.java:1002)
at knot//net.minecraft.class_310.method_1514(class_310.java:957)
at knot//net.minecraft.client.main.Main.main(Main.java:265)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)

Sounds like an incompatibility with MC 1.12.3. Thank you for your report, I'll fix this asap

It is fixed with the new version, thanks for your report