Linked issues
Comments

Can confirm.
Code analysis:
protected ItemInteractionResult useItemOn(ItemStack itemStack, BlockState blockState, Level level, BlockPos blockPos, Player player, InteractionHand interactionHand, BlockHitResult blockHitResult) {
. . .
level.setBlock(blockPos, Blocks.CARVED_PUMPKIN.defaultBlockState().setValue(CarvedPumpkinBlock.FACING, direction1), 11);
-> ISSUE START
ItemEntity itementity = new ItemEntity(
level,
(double)blockPos.getX() + 0.5D + (double)direction1.getStepX() * 0.65D,
(double)blockPos.getY() + 0.1D,
(double)blockPos.getZ() + 0.5D + (double)direction1.getStepZ() * 0.65D,
new ItemStack(Items.PUMPKIN_SEEDS, 4)
);
-> ISSUE END
itementity.setDeltaMovement(0.05D * (double)direction1.getStepX() + level.random.nextDouble() * 0.02D, 0.05D, 0.05D * (double)direction1.getStepZ() + level.random.nextDouble() * 0.02D);
. . .
}
}
Confirmed, there is no loot table of this nature located in either the gameplay folder or the blocks folder.