RN documentation says:

The Geolocation API extends the web spec: https://developer.mozilla.org/en-US/docs/Web/API/Geolocation

If open that site, we can find

PositionOptions.maximumAge Secure context
Is a positive long value indicating the maximum age in milliseconds of a possible cached position that is acceptable to return. If set to 0, it means that the device cannot use a cached position and must attempt to retrieve the real current position. If set to Infinity the device must return a cached position regardless of its age. Default: 0

So that default value is 0

While in actual RN implementation
android
ios

You can see that default value is INFINITY.

In conclusion: I think need to either edit RN docs and put an additional comment about that difference or change the implementation to fit Mozilla docs.

Thank you!