PQescapeByteaConn - returns wrong string for PG9.1 Beta3

If  I use PQescapeByteaConn() for a conenction to a PG9.1 Beta3 server, this function returns (e.g.) "\xea2abd8ef31...(and so on.)...".

Here the problem: there should be a second backslash in the prefix. The SQL Statement which uses this string (INSERT statement in my case) returns with an error ("Invalid byte sequence..."). If I add the second backslash manually everything works fine.

When connecting to a PG9.0 server and using this function, the return value is correct (with two backslashes): "\\xea2abd8ef31...( and so on.)...".

This should be a bug in PG9.1 Beta3

Regards

Petro