syncrepl missing/ignoring {md5} passwords?

[Ade Fewings <ade@techniumcast.com>]

Dear all

We are setting up an OpenLDAP 2.3.34 directory server structure and I 
have started using syncrepl to produce replica servers.  Everything is 
going OK, except that userPassword's crypt'd using {MD5} rather than 
{crypt} do not find their way to the slave servers.  The {crypt} 
passwords get there fine, however. 

Master slapd.conf bit:
> #
> # syncrepl setup
> #
> overlay syncprov
> syncprov-checkpoint 100 10
> syncprov-sessionlog 100


Slave slapd.conf bit:
> # syncrepl setup
> #
> syncrepl rid=123
>         provider=ldap://directory.a.com:389
>         type=refreshAndPersist
>         searchbase="dc=a,dc=com"
>         scope=sub
>         bindmethod=simple
>         binddn="cn=syncuser,dc=a,dc=com"
>         credentials=#######


Can anybody offer any guidance?  I'm sure I've just made a simple config 
error, but a lot of searching and playing has not revealed anything, so 
it would be appreciated.

Cheers
Ade