Custom plugin map / multi-mono / jumps to L channel every time

[Schottlandru]

Hello,

I am currently surprised by custom plugin maps on a multi channel aux.
On my Dia aux, I configured a map for a multi-mono plugin.
I want to have Center selected to see the processing.
Every time I touch a fader (plugin map), it switches back to showing L (left channel).

Anybody else seeing this?

I remember this working a while back though (old plugin expand maps).

Thanks for any ideas!!
Andrew