Light mode is incompatible with vim-lsp-cxx-highlight

[kongjun18]

vim-lsp-cxx-highlight is a C++ highlight plugin based on LSP. It works properly for other light color schemes such as edge.

In dark mode, everything seems to be OK. In light mode, however, variable is displayed in white and it is hard to distinguish. Is it a bug of vim-colors-github?

Vim version: Vim 8.2 and Neovim-nightly

Screenshot(Vim which only installs vim-lsp-cxx-highlight(coc.nvim) and vim-colors-github):