let's get serious.
the crew probably missed a handoff...it happens. I" ve heard of it happening and other planes had to call, selcal was tried and the like...it really is too bad that ''center'' can't use all freqs, but that's the budget.
and boys and girls...if you are going to get into a discussion...keep your situational awareness even if the other guy doesn't.
I'll say one more thing. When I first started with my airline, we had to monitor our company GUARD frequency. A vhf freq for our airline. We had to keep the volume up and the speaker selected. Modern ways should not have changed such simple precautions.