EDE 18/20 recursion failures after devel release upgrade 9.21.14 -> 9.21.15. bug, or config change req'd?

[pgnd]

> To be clear, you're saying this version did NOT work?
well, apparently not quite :-/

took me a minute to 'clarify' for myself ...

after a clean build from source, flush/purge everything,
trying to get to an explicit config that works, by simple naive toggling,

this fails
```
	notify          no;
	recursion yes;
	allow-recursion      { any; };
	allow-recursion-on   { any; };
	allow-query          { acl_local_lan; localhost; };
```


simply adding this
```
+	allow-query-cache    { acl_local_lan; localhost; };
```

works.

and this i can now toggle back & forth.