Just did a fresh build but the same problem persists. Specifically for me these are the errors during build:
1> [3774/4576] UE4Editor-ResonanceAudio.lib
1>CMakeCCompilerId.c.obj : warning LNK4006: main already defined in CMakeCXXCompilerId.cpp.obj; second definition ignored
1>main.c.obj : warning LNK4006: main already defined in CMakeCXXCompilerId.cpp.obj; second definition ignored
1> Creating library E:\Projekte\UnrealEngine\Engine\Engine\Plugins\Runtime\ResonanceAudio\Intermediate\Build\Win64\UE4Editor\Development\ResonanceAudio\UE4Editor-ResonanceAudio.lib and object E:\Projekte\UnrealEngine\Engine\Engine\Plugins\Runtime\ResonanceAudio\Intermediate\Build\Win64\UE4Editor\Development\ResonanceAudio\UE4Editor-ResonanceAudio.exp
1> [4288/4576] UE4Editor-ResonanceAudio.dll
1>CMakeCCompilerId.c.obj : error LNK2005: main already defined in CMakeCXXCompilerId.cpp.obj
1>main.c.obj : error LNK2005: main already defined in CMakeCXXCompilerId.cpp.obj
1> Creating library E:\Projekte\UnrealEngine\Engine\Engine\Plugins\Runtime\ResonanceAudio\Intermediate\Build\Win64\UE4Editor\Development\ResonanceAudio\UE4Editor-ResonanceAudio.suppressed.lib and object E:\Projekte\UnrealEngine\Engine\Engine\Plugins\Runtime\ResonanceAudio\Intermediate\Build\Win64\UE4Editor\Development\ResonanceAudio\UE4Editor-ResonanceAudio.suppressed.exp
1>E:\Projekte\UnrealEngine\Engine\Engine\Plugins\Runtime\ResonanceAudio\Binaries\Win64\UE4Editor-ResonanceAudio.dll : fatal error LNK1169: one or more multiply defined symbols found
So at least in my case, it appears to be an issue with the ResonanceAudio plugin.