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I've thought about this one plenty
Not sure what your exact concern is, here is the ProxyHA best practice: Best Practices: Proxy HA
In general, we want you to have the same version for nodes in the same cluster. This is especially true for proxyHA, as filtering could be different.
If somewhere in your question your concerned about upgrading, here is a good explanation:
Thanks for your reply.
I will test it today and keep you informed.
I agree about the best practices, I'm pretty sure that my customer is not using them.
I'm working on my environment trying to replicate the scenario.
Btw, I'll keep you informed.