This update removes a modification introduced in early Beta builds (prior to the availability of this style in this XenForo official forum). I wrote that definition when I was trying to compensate with something in XF 2.1 default template, but it looks like a wrong approach.
By removing this modification (actually, I commented it out using "//"), it solves compatibility issues with certain aftermarket addons.
I simply commented out the 104th line of "cscn_theme_customize.less":
Beta 21 brings compatibility improvements for XenForo 2.2.3. It also fixes a bug in recent XF2.2-oriented releases that search-forum nodes are not styled. Now they are styled as same as previous node types offered in XenForo 2.1 releases.