Hmm. Your example works for me ( v5.8.1-RC3 built for darwin-thread-multi-2level):

$ perl -e 'Lie->Pkg::Meth()'
Can't locate object method "Meth" via package "Pkg" (perhaps you forgo
+t to load "Pkg"?) at -e line 1.
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Is this a new or unstable feature?
I checked 5.8.1-RC3 (works), 5.8.0 (works), 5.6.1 (works).

And contrary to what I thought, you do not have to use a blessed reference, a package name is fine as well. It also works with a string scalar:

$ perl -e '$a = "Lie"; $a->Pkg::Meth()'
Can't locate object method "Meth" via package "Pkg" (perhaps you forgo
+t to load "Pkg"?) at -e line 1.
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But not with other types of parameters (that cannot qualify as class name or object instance):

$ perl -e '$a = []; $a->Pkg::Meth()'
Can't call method "Pkg::Meth" on unblessed reference at -e line 1.
$ perl -e '$a = 123; $a->Pkg::Meth()'
Can't call method "Pkg::Meth" without a package or object reference at
+ -e line 1.
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