source script2.sh

export someVar=something

source script1.sh arg1 arg2

source script2.sh arg1 arg2

echo "Number of parameters before: $#"
set --
echo "Number of parameters after : $#"
source script2.sh

echo "script2.sh received $# parameters"

Number of parameters before: 2
Number of parameters after : 0
script2.sh received 0 parameters