[minecraft/ModelBakery]: Exception loading blockstate definition: 'modernminecarts:blockstates/sloped_rail.json' missing model for variant:

Message spammed dozens to hundreds of times in a row.

minecraft/RecipeManager]: Parsing error loading recipe modernminecarts:copper_upgrade_smithing_template
com.google.gson.JsonSyntaxException: Unknown item 'modernminecarts:copper_upgrade_smithing_template'

Missing a recipe or something similar.

1.19.2

minecraft/RecipeManager]: Parsing error loading recipe modernminecarts:copper_upgrade_smithing_template
com.google.gson.JsonSyntaxException: Unknown item 'modernminecarts:copper_upgrade_smithing_template'
Artifacts from porting to 1.19 where smithing templates don't exist. Should be removable.

[minecraft/ModelBakery]: Exception loading blockstate definition: 'modernminecarts:blockstates/sloped_rail.json' missing model for variant:
Definition error with sloped rail, I'll see if I can remove it.

At least both errors shouldn't affect gameplay.

Just encountered the same thing