Why does my loop ends after first execution

Question

I am trying to loop through a csv file and execute Blender to render the output. I am new to bash and trying to figure out why the loop ends prematurely after just 1st rendering. I only see it render first image in the folder.

blend.csv

3123,test1
3124,test2
3125,test3
3126,test4

bash.sh

#!/bin/bash

while IFS=, read -r id text
do
    echo "from csv $id $text"
    exec </Applications/Blender.app/Contents/MacOS/Blender -b ImageText.blend --python ImpostScript.py -- $id $text
done <blend.csv