[perl #67040] [BUG] state $x //= ... doesn't work

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# New Ticket Created by  Moritz Lenz 
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20:11 <@moritz_> rakudo: sub a { state $x //= 3; $x++; say $x }; a(); a()
20:12 < p6eval> rakudo 6c43f9: OUTPUT«4␤4␤»

Although that's better written as 'state $x = 3', it should IMHO give
the result 4\n5\n, not 4\n4\n

Cheers,
Moritz