With the new version of zeek u need to specify local variables ascaptures

[giovanni-bellini-argo]

as the title says the new versions of zeek need to have the local variables definied in captures

https://docs.zeek.org/en/master/script-reference/types.html#anonymous-function
https://docs.zeek.org/en/master/script-reference/statements.html#when

i'm up to open a pr if u want.