[perl #68672] error message "ResizablePMCArray: Can't pop from an empty array!" on non-terminated ternary

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# New Ticket Created by  Moritz Lenz 
# Please include the string:  [perl #68672]
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Rakudo 8e0b7409d757fa938f0a3176a192291a8e9e3996:
$ perl6 -e '1 ?? 1;'
ResizablePMCArray: Can't pop from an empty array!
in Main (src/gen_setting.pm:3369)

(PGE bug?)

STD.pm says:
     Found ?? but no !!; possible precedence problem at ...

Cheers,
Moritz