Solution found on IRC. Recursion for Expression was missing.
This will make it work:
my $dsl = <<'END_OF_DSL';
:default ::= action => [name,values]
lexeme default = latm => 1
Expression ::=
Expression '+' Term action => do_add
| Term action => ::first
Term ::=
Term '*' Factor action => do_multiply
| Factor action => ::first
Factor ::= Number action => ::first
Number ~ digits
digits ~ [\d]+
:discard ~ whitespace
whitespace ~ [\s]+
END_OF_DSL
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