RobWells[m]: I have these custom mappings inside my nvim-cmp config:
```lua
          ["<CR>"] = cmp.mapping.confirm({
            behavior = cmp.ConfirmBehavior.Insert,
            select = true,
          }),
          ["<C-x>"] = cmp.mapping.confirm({
            behavior = cmp.ConfirmBehavior.Replace,
            select = true,
          }),
```
It works for non-rust files and non-lsp completion sources (not sure if the problematic completions are really from lsp because it does not say, but this might be a hint that this is a LSP or rustaceanvim issue). Anyway, I am trying out blink.cmp now as well..