I found this in a schematic on the web. I don't understand the use of this capacitor.
Partial circuit diagram:
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The answer may be in the layout of the PCB. It is possible that some high frequency return current(s) need a path back to their source but the reference plane is split between 3V3 and 24V0.
The capacitor would "stitch" 3V3 and 24V0 at high frequencies to allow for the current(s) to return back. The downside is that now high frequency noise can also couple between the voltage rails.