select fieldname with space not quoted correct

[everyx]

Bug Report

Q	A
Version(s)	2.13.4

Summary

I want do

"INSERT INTO `news` (`published_on`, `title`, `body`, `summary`, `sort`) SELECT `2021-09-29 20:07:56` AS `published_on`, `Title` AS `title`, `test` AS `body`, `test` AS `summary`, IFNULL(MAX(sort), 0) + 1 AS `sort` FROM `news`"

Current behavior

current sql is

"INSERT INTO `news` (`published_on`, `title`, `body`, `summary`, `sort`) SELECT `2021-09-29` `20:07:56` AS `published_on`, `Title` AS `title`, `test` AS `body`, `test` AS `summary`, IFNULL(MAX(sort), 0) + 1 AS `sort` FROM `news`"

How to reproduce

$data = [
    "published_on":"2021-09-29 20:07:56",
    "title":"Title",
    "body":"test",
    "summary":"test"
    "sort": new Expression("IFNULL(MAX($sortingFieldName), 0) + 1")
];
$select = new Select();
$select->from('news')->columns($data, false);

$insert = new Insert();
$columns = array_keys($data);
$insert->into('news')->columns($columns)->values($select);
echo new Sql($this->adapter, 'news');->buildSqlString($insert);

Expected behavior

use

`2021-09-29 20:07:56` AS `published_on` 

not

`2021-09-29` `20:07:56` AS `published_on` 

I found some related issues: #84 and #146