[perl #64204] [BUG] rakudo - Null PMC access when 'say ::SomeThing'

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# New Ticket Created by  Hojung Yoon 
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<amoc> rakudo: say ::SomeThing
<p6eval> rakudo 0f50d4: OUTPUT«Null PMC access in isa()␤current instr.:
'parrot;List;!flatten' pc 5960 (src/classes/List.pir:227)␤»