EXPORT_TAGS does not export a defined tag

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package tmod;
use 5.20.0;
...
our $v2='';

1;

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use 5.20.0;
use strict;
...

say "done"; 
exit;

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perl test_tmod.pl
"tag_v0" is not exported by the tmod module
Can't continue after import errors at test_tmod.pl line 5.
BEGIN failed--compilation aborted at test_tmod.pl line 5.

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