Each example must be run separately. You're getting the value of $x defined from the previous test. If you run the 2nd one by itself, however:
$ perl -le '
BEGIN { my $x = 1; }
print defined $x
? "defined"
: "undefined";'
undefined
And with strict:
$ perl -Mstrict -le '
BEGIN { my $x = 1; }
print $x;'
Global symbol "$x" requires explicit package name at -e line 2.
Execution of -e aborted due to compilation errors.
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