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From man:

-d delim

 

The first character of delim is used to terminate the input line, rather than newline.

Your element 5 doesn't have a delimiter (comma), so it won't be read.

From man:

-d delim

The first character of delim is used to terminate the input line, rather than newline.

Your element 5 doesn't have a delimiter (comma), so it won't be read.

From man:

-d delim

                The first character of delim is used to terminate the input line, rather than newline.

Your element 5 doesn't have a delimiter (comma) ... so it won't read

From man:

-d delim

The first character of delim is used to terminate the input line, rather than newline.

Your element 5 doesn't have a delimiter (comma), so it won't be read.

From man:

-d delim

                The first character of delim is used to terminate the input line, rather than newline.

Your element 5 doesn't have a delimiter (comma) ... so it won't read

to fix :

echo '0,1,2,3,4,5,' | while read -d, i; do echo $i; done
0
1
2
3
4
5

From man:

-d delim

                The first character of delim is used to terminate the input line, rather than newline.

Your element 5 doesn't have a delimiter (comma) ... so it won't read