Resolved Internal Shader Errors for Terrain when Building 2020.3.37

Hi, when I try to build my project, I get these shader errors:

Code (CSharp):

1. Shader error in 'Nature/Terrain/Standard': maximum ps_4_0 sampler register index (16) exceeded at Files/Unity/Hub/Editor/2020.3.37f1/Editor/Data/CGIncludes/TerrainSplatmapCommon.cginc(43) (on d3d11)
2.  
3. Compiling Fragment program with DIRECTIONAL INSTANCING_ON LIGHTMAP_ON LIGHTPROBE_SH SHADOWS_SCREEN SHADOWS_SHADOWMASK _ALPHATEST_ON _NORMALMAP
4. Platform defines: SHADER_API_DESKTOP UNITY_ENABLE_DETAIL_NORMALMAP UNITY_ENABLE_REFLECTION_BUFFERS UNITY_HARDWARE_TIER1 UNITY_LIGHTMAP_FULL_HDR UNITY_LIGHT_PROBE_PROXY_VOLUME UNITY_NO_SCREENSPACE_SHADOWS UNITY_PASS_FORWARDBASE UNITY_PBS_USE_BRDF3 UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS
5. Disabled keywords: DIRLIGHTMAP_COMBINED DYNAMICLIGHTMAP_ON FOG_EXP FOG_EXP2 FOG_LINEAR LIGHTMAP_SHADOW_MIXING SHADER_API_GLES30 UNITY_ASTC_NORMALMAP_ENCODING UNITY_COLORSPACE_GAMMA UNITY_ENABLE_NATIVE_SHADOW_LOOKUPS UNITY_HALF_PRECISION_FRAGMENT_SHADER_REGISTERS UNITY_HARDWARE_TIER2 UNITY_HARDWARE_TIER3 UNITY_LIGHTMAP_DLDR_ENCODING UNITY_LIGHTMAP_RGBM_ENCODING UNITY_METAL_SHADOWS_USE_POINT_FILTERING UNITY_NO_DXT5nm UNITY_NO_FULL_STANDARD_SHADER UNITY_PBS_USE_BRDF1 UNITY_PBS_USE_BRDF2 UNITY_PRETRANSFORM_TO_DISPLAY_ORIENTATION UNITY_SPECCUBE_BLENDING UNITY_SPECCUBE_BOX_PROJECTION UNITY_VIRTUAL_TEXTURING
6.  

Code (CSharp):

1. Shader error in 'Hidden/TerrainEngine/Splatmap/Standard-AddPass': maximum ps_4_0 sampler register index (16) exceeded at Files/Unity/Hub/Editor/2020.3.37f1/Editor/Data/CGIncludes/TerrainSplatmapCommon.cginc(43) (on d3d11)
2.  
3. Compiling Fragment program with DIRECTIONAL INSTANCING_ON LIGHTMAP_ON LIGHTPROBE_SH SHADOWS_SCREEN SHADOWS_SHADOWMASK _ALPHATEST_ON _NORMALMAP
4. Platform defines: SHADER_API_DESKTOP UNITY_ENABLE_DETAIL_NORMALMAP UNITY_ENABLE_REFLECTION_BUFFERS UNITY_HARDWARE_TIER1 UNITY_LIGHTMAP_FULL_HDR UNITY_LIGHT_PROBE_PROXY_VOLUME UNITY_NO_SCREENSPACE_SHADOWS UNITY_PASS_FORWARDBASE UNITY_PBS_USE_BRDF3 UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS
5. Disabled keywords: DIRLIGHTMAP_COMBINED DYNAMICLIGHTMAP_ON FOG_EXP FOG_EXP2 FOG_LINEAR LIGHTMAP_SHADOW_MIXING SHADER_API_GLES30 UNITY_ASTC_NORMALMAP_ENCODING UNITY_COLORSPACE_GAMMA UNITY_ENABLE_NATIVE_SHADOW_LOOKUPS UNITY_HALF_PRECISION_FRAGMENT_SHADER_REGISTERS UNITY_HARDWARE_TIER2 UNITY_HARDWARE_TIER3 UNITY_LIGHTMAP_DLDR_ENCODING UNITY_LIGHTMAP_RGBM_ENCODING UNITY_METAL_SHADOWS_USE_POINT_FILTERING UNITY_NO_DXT5nm UNITY_NO_FULL_STANDARD_SHADER UNITY_PBS_USE_BRDF1 UNITY_PBS_USE_BRDF2 UNITY_PRETRANSFORM_TO_DISPLAY_ORIENTATION UNITY_SPECCUBE_BLENDING UNITY_SPECCUBE_BOX_PROJECTION UNITY_VIRTUAL_TEXTURING
6.  

I am unable to debug and fix these errors because they're internal to Unity.
I am running Unity 2020.3.37f1
Is this a configuration issue, or a bug?