It seems likely that adding the subroutine call altered the scope of Asub2. Perhaps you deleted a closing curly brace or a semi-colon?
Are you using warnings and strict? What does perlcritic say? When you use perl-tidy, is Asub3 indented the way you think it should be?
If you aren't using these tools to analyze your problem, is there a reason for skipping them?
As Occam said: Entia non sunt multiplicanda praeter necessitatem.
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