pcache template doesn't allow negative assertions?

OpenLDAP version 2.4.23

Negative assertions don't appear to work in pcacheTemplate filter expressions. Is this intentional?

line 435 (pcacheTemplate (!(globalOff=)) 0 900) /local/etc/openldap/proxy/slapd.conf: line 435: unable to parse template: AttributeDescription contains inappropriate characters. slaptest: bad configuration file!

Works fine without the negative assertion.

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Somewhat related question. I'm attempting to use pcache to expedite the application of a filter expression used in an ACL context (ldap backend). I haven't done this before. Does pcache work for this purpose? e.g.

access to dn.sub="ou=email" filter="(!(globalOff=))" ...

(this is a simplification of what I'm really doing, for illustrative purposes only).