completionItem/resolve strips newlines

Here is an example showing the documentation returned for dplyr::select to the Emacs client lsp-mode. Text from different sections and some text that is bulleted (in non-languageserver document viewers) is concatenated without newlines. For Emacs, UI packages that render the documentation for completion items (e.g., company-box) render it as one long string that runs off the edge of the monitor.

[Trace - 06:14:01 PM] Received response 'completionItem/resolve - (396)' in 53ms.
Result: {
  "documentation": {
    "value": " Select (and optionally rename) variables in a data frame, using a concise mini-language that makes it easy to refer to variables based on their name (e.g. `a:f` selects all columns from `a` on the left to `f` on the right). You can also use predicate functions like is.numeric to select variables based on their properties. Overview of selection features   Tidyverse selections implement a dialect of R where operators make it easy to select variables:   `:` for selecting a range of consecutive variables.  `!` for taking the complement of a set of variables.  `&` and `|` for selecting the intersection or the union of two sets of variables.  `c()` for combining selections.   In addition, you can use selection helpers . Some helpers select specific columns:   `everything()` : Matches all variables.  `last_col()` : Select last variable, possibly with an offset.   These helpers select variables by matching patterns in their names:   `starts_with()` : Starts with a prefix.  `ends_with()` : Ends with a suffix.  `contains()` : Contains a literal string.  `matches()` : Matches a regular expression.  `num_range()` : Matches a numerical range like x01, x02, x03.   These helpers select variables from a character vector:   `all_of()` : Matches variable names in a character vector. All names must be present, otherwise an out-of-bounds error is thrown.  `any_of()` : Same as `all_of()` , except that no error is thrown for names that don't exist.   This helper selects variables with a function:   `where()` : Applies a function to all variables and selects those for which the function returns `TRUE` .  ",
    "kind": "markdown"
  },
  "_emacsStartPoint": 163,
  "insertTextFormat": 2,
  "insertText": "select($0)",
  "sortText": "4-select",
  "detail": "{dplyr}",
  "kind": 3,
  "label": "select"
}

Start by tracing the completionItem/resolve handling that produces the documentation value in the shown response, then check how markdown content is assembled before it is returned to the Emacs client. Done means section and bullet boundaries retain newlines in the resolved documentation while remaining valid for the language-server protocol.