[perl #131509] Dynamic vars aren't visible inside Promise.then

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# New Ticket Created by  Zoffix Znet 
# Please include the string:  [perl #131509]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=131509 >


I expected the .then'ed code to be in my dynamic scope so it'd see the variable 
I'm using, same as it's seen in a start block:

<Zoffix__> m: my $*FOO = 42; sub bar (&code) { code }; bar { say $*FOO; await 
start { say $*FOO }.then: { say $*FOO // 'aint there' } }
<camelia> rakudo-moar 3755c0: OUTPUT: «42␤42␤aint there␤»