when using the client against openmq protocol version 1.0 is preferred over 1.2.

I guess its based on a implementation detail of openmq.

when changing the order of the versions array to

private $versions = [Version::VERSION_1_2, Version::VERSION_1_1, Version::VERSION_1_0];

it properly connects with protocol version 1.2.

so openmq seem to prefers the first version it supports of this list