Change clock propagation through multiplexers

It's just strange that this is the default behaviour of Quartus since you almost never want this to happen.
It is only in very rare cases so I would think that there maybe was a setting for this.

But independent from the different user preference, I would expect Quartus to do some kind of analysis to know which clocks can be active at the same time. Or at least some simple checks. That could already solve many unnecessary timing fixes in the design.

P.S.: I do not see how your references can simplify my example case. If so, please explain to me