How to reproduce:
1. Create a new or open any project
2. Extract the attached “UMApackage“ folder and move it into the Assets folder

Reproducible with: 2022.3.59f1, 6000.0.41f1,  6000.1.0b9, 6000.2.0a1
Not reproducible with: 6000.2.0a6
Fixed in: 6000.2.0a2

Reproducible on: macOS 15.2 Sequoia (Intel), Windows 11 (by user)
Not reproducible on: No other environment tested

First few lines of the stack trace:
#0 0x00000109db25d8 in core::base_hash_set<core::pair<core::basic_string<char, core::StringStorageDefault<char>> const, keywords::LocalKeyword, true>, core::hash_pair<core::hash<core::basic_string_ref<char>>, core::basic_string<char, core::StringStorageDefault<char>>>, core::equal_pair<std::__1::equal_to<core::basic_string_ref<char>>, core::basic_string<char, core::StringStorageDefault<char>>>>::node* core::base_hash_set<core::pair<core::basic_string<char, core::StringStorageDefault<char>> const, keywords::LocalKeyword, true>, core::hash_pair<core::hash<core::basic_string_ref<char>>, core::basic_string<char, core::StringStorageDefault<char>>>, core::equal_pair<std::__1::equal_to<core::basic_string_ref<char>>, core::basic_string<char, core::StringStorageDefault<char>>>>::lookup<core::basic_string<char, core::StringStorageDefault<char>>, core::equal_pair<std::__1::equal_to<core::basic_string_ref<char>>, core::basic_string<char, core::StringStorageDefault<char>>>>(core::basic_string<char, core::StringStorageDefault<char>> const&, core::equal_pair<std::__1::equal_to<core::basic_string_ref<char>>, core::basic_string<char, core::StringStorageDefault<char>>> const&) const
#1 0x00000109dae831 in keywords::LocalSpace::Find(core::basic_string<char, core::StringStorageDefault<char>> const&) const
#2 0x00000109dae710 in keywords::KeywordRemap::Init(keywords::LocalSpace const&, keywords::LocalSpace const&)
#3 0x00000109dcefb8 in ShaderLab::IntShader::ResolveFallback(ShaderLab::SerializedShader const&, Shader*, core::vector<PPtr<Shader>, core::allocator<PPtr<Shader>, 0ul>>&, bool)
#4 0x00000109d5e9c7 in ShaderLab::IntShader::CreateFromSerializedShaderMainThread(ShaderLab::IntShader*, ShaderLab::SerializedShader const&, core::vector<PPtr<Shader>, core::allocator<PPtr<Shader>, 0ul>>&, bool, Shader*)