Third-party libs not copied under Binaries/Win64 when pre-compiling plugin using UAT

In my plugin’s Build.cs file I add thirdaprty libraries to PublicAdditionalLibraries (for .libs) and RuntimeDependencies (for .dlls). The binaries themselves placed under Source/Thirdparty path. Everything works fine for PIE and when packaged, i.e. DLLs are copied under Binaries/Win64 folder and are discovered by Unreal when loading the plugin.

However, when I build the plugin using UAT, I see no .dlls under Binaries/Win64 folder and this causes projects that use plugin to fail loading.

These are the commands I use to build with UAT:
BuildPlugin -TargetPlatform=Win64 -Plugin=PLUGIN_PATH -Package=BUILD_PATH -precompile.

What shall I configure in .Build.cs file in order for the thirdparty binaries to be properly copied when pre-building the plugin?