Rider downloads files each time Xamarin.Android project is opened/reloaded

The company I work for has a Xamarin based solution targeting Android and iOS. The solution consists of a Xamarin.Android project, a Xamarin.iOS project, and a shared library containing common classes. After upgrading to Rider 2018.3, I started receiving the messages below (and associated balloon notifications) every time the solution is opened or the Xamarin.Android project is reloaded. This happens on Windows and macOS. Shouldn't these files be cached somewhere so Rider doesn't have to download them every time? Does this indicate that I have a configuration problem somewhere?

Here are the messages I see in the Event Log:

15:23 The following files were downloaded:: support-annotations-27.0.2.jar (show balloon)

15:23 The following files were downloaded:: constraint-layout-1.1.0.aarconstraint-layout-solver-1.1.0.jar (show balloon)

15:23 The following files were downloaded:: design-27.0.2.aarsupport-v4-27.0.2.aarsupport-compat-27.0.2.aarruntime-1.0.3.aarcommon-1.0.3.jarcommon-1.0.0.jarsupport-media-compat-27.0.2.aarsupport-core-utils-27.0.2.aarsupport-core-ui-27.0.2.aarsupport-fragment-27.0.2.aarappcompat-v7-27.0.2.aarsupport-annotations-27.0.2.jarsupport-vector-drawable-27.0.2.aaranimated-vector-drawable-27.0.2.aarrecyclerview-v7-27.0.2.aartransition-27.0.2.aar (show balloon)

15:23 The following files were downloaded:: support-v4-27.0.2.aarsupport-compat-27.0.2.aarsupport-annotations-27.0.2.jarruntime-1.0.3.aarcommon-1.0.3.jarcommon-1.0.0.jarsupport-media-compat-27.0.2.aarsupport-core-utils-27.0.2.aarsupport-core-ui-27.0.2.aarsupport-fragment-27.0.2.aar (show balloon)

15:23 The following files were downloaded:: appcompat-v7-27.0.2.aarsupport-annotations-27.0.2.jarsupport-core-utils-27.0.2.aarsupport-compat-27.0.2.aarruntime-1.0.3.aarcommon-1.0.3.jarcommon-1.0.0.jarsupport-fragment-27.0.2.aarsupport-core-ui-27.0.2.aarsupport-vector-drawable-27.0.2.aaranimated-vector-drawable-27.0.2.aar (show balloon)

15:23 The following files were downloaded:: cardview-v7-27.0.2.aarsupport-annotations-27.0.2.jar (show balloon)

15:23 The following files were downloaded:: recyclerview-v7-27.0.2.aarsupport-annotations-27.0.2.jarsupport-compat-27.0.2.aarruntime-1.0.3.aarcommon-1.0.3.jarcommon-1.0.0.jarsupport-core-ui-27.0.2.aar (show balloon)

15:23 The following files were downloaded:: support-vector-drawable-27.0.2.aarsupport-annotations-27.0.2.jarsupport-compat-27.0.2.aarruntime-1.0.3.aarcommon-1.0.3.jarcommon-1.0.0.jar (show balloon)

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