Bug Receiving Shader Errors on Build - URP - "Lit" Shader (v2021.3)

Hello,

I am received 2 errors when trying to build my project as follows:

"Shader error in 'Universal Render Pipeline/Lit': maximum ps_4_0 sampler register index (16) exceeded at PC/Library/PackageCache/com.unity.render-pipelines.universal@12.1.10/ShaderLibrary/LightCookie/LightCookieInput.hlsl(12) (on d3d11)"

AND

"Shader error in 'Universal Render Pipeline/Lit': maximum ps_5_0 sampler register index (16) exceeded at PC/Library/PackageCache/com.unity.render-pipelines.universal@12.1.10/ShaderLibrary/LightCookie/LightCookieInput.hlsl(12) (on d3d11)"

Upon inspecting my "Lit" shader, I noticed these 2 errors errors are actually listed on the shader itself under "Errors" under the Compiled Code button. In addition, the top section is greyed out (everything above "Imported Object") so I can't access the "Use Project Settings" dropdown

This is causing random crashing in my game at the moment, but seemingly no issues in the editor itself, only on build. The project builds fully (with these two errors), and will generally launch and play for a few minutes, but then will crash without any kind of crash report or error message, just sort of closes out of nowhere.

I tried deleting my Library folder and then reimporting everything, but that didn't solve the issue.

Any help is appreciated

-Rob