crystal oscillators connected in parallel
If I drew a circuit with two crystals connected in parallel it's because on the Bill of Material I would be choosing either one or the other. The PCB layout would be tracked to take version A or version B but only one would be soldered to the PCB. This gives me the ability to buy version B if version A became unavailable.

It's like showing pull-ups and pull-downs on the same IO line - it makes no sense to fit both but, as a design, I may want the option of fitting one or the other.