The OO part in your topic is a red herring.
It has nothing to do with OO. Or bless. Or hashes. Or even references.
If you do this:
$var2 = "foo";
$var1 = $var2;
$var2 = "bar";
print $var1;
Do you expect it to print "bar"? It won't, and shouldn't. If you replace in the above code
$var2 with
$object->{a}->{var2},
$var1 with
$object->{b}->{var1},
"foo" with
bless {}, "A1"; and
"bar" with
$dummy, you get what you are doing.
If you want to get at the current value of a variable, store a reference to that value.
$var2 = "foo";
$var1 = \$var2;
$var2 = "bar";
print $$var1; # Prints "bar", not "foo".
(Fixed typo pointed to by thor)
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