Do ignored input characters for "negated scanset" specification, get stored in data buffer, while programming in C ?

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C

string

formatting

#include<stdio.h>
main()
{
 char name[15],age[3];
 printf("Please enter your name :\n");
 scanf("%[^$]",&name);
 printf("Your name is %s.\n",name);
 printf("Please enter your age :\n");
 scanf("%s",&age);
 printf("Your age is %s\n",age);
 getch();
}

Input :
Shubham$$
Output :
Your name is Shubham.
Please enter your age :
Your age is $$

From the output, it is clear that even though the rejected invalid character(i.e.,$) is not shown in the output, but they have been stored to the data buffer, so the next input for age is the data left in buffer i.e.,$$.
My Question : I want to confirm that is this behaviour expected in every case.i.e., Does the rejected characters always get stored to the data buffer ?

What I have tried:

I have tried it in 2-3 programs but i want to know whether is this always the case ?
That the rejected characters are stored in the buffer every time we use negated scanset.