Spacing Issue Between Chapter Title and Chapter Title Body | Long Chapter Title

How do I remove the spacing between Chapter and its name?

CHAPTER#

CHAPTER NAME

to 

CHAPTER#
CHAPTER NAME

I have tried using

titleformat{chapter}[display]{fontsize{20}{24}selectfontbfseriescentering}{CHAPTER thechapter}{-5mm}{}[]

But, for long titles that will expand to multiple lines the spacing will be inconsistent. You can see the spacing between CHAPTER 1 and LONG CHAPTER THAT WILL CAUSE THIS ISSUE. How do I fix this? And make the content of the title close to the chapter number without inconsistency.

Here is a MWE

documentclass[12pt,a4paper]{report}
usepackage[utf8]{inputenc}
usepackage{parskip}
usepackage{fontspec}
usepackage{inputenc}
usepackage[T1]{fontenc}
usepackage{amssymb} % MATH SYMBOLS
usepackage{anyfontsize} % Font size
usepackage{titlesec} % Title format
usepackage{setspace} % setting stretch
usepackage{geometry} % Paper margins
usepackage{fancyhdr} % Fix page numbering


%================================================================
%         FONT SETTING
%================================================================

geometry{a4paper,left=2.54cm,right=2.54cm,top=2.54cm,bottom=2.54cm}
setstretch{1.15}
setlength{parindent}{0em}
setlength{parskip}{8pt}
linespread{1.08}
renewcommand{baselinestretch}{1.08}
setmainfont{Times New Roman}


%================================================================
%         TITLE SETTING
%================================================================
titleformat{chapter}[display]{fontsize{20}{24}selectfontbfseriescentering}{CHAPTER 
thechapter}{-5mm}{}[]
titleformat{section}
{fontsize{14}{16.8}selectfontbf}
{thesection.}{0.5em}{}
titleformat{subsection}
{fontsize{13}{18.2}bf}
{thesubsection.}{0.5em}{}
titlespacing{section}{0in}{12pt}{8pt}
titlespacing{chapter}{0cm}{0cm}{0cm}
titlespacing{subsection}{0in}{12pt}{8pt}
%================================================================
%         NAMES IN title/names_super
%================================================================



begin{document}

chapter{LONG CHAPTER THAT WILL CAUSE THIS ISSUE}


end{document}

documentclass[12pt,a4paper]{report}
usepackage[skip=8pt]{parskip}
usepackage{titlesec} % Title format
usepackage{geometry} % Paper margins
geometry{a4paper,left=2.54cm,right=2.54cm,top=2.54cm,bottom=2.54cm}
usepackage{fontspec}
  setmainfont{Times New Roman}
%================================================================
%         FONT SETTING
%================================================================
usepackage{fontsize}
  changefontsize[16.2]{12}
%================================================================
%         TITLE SETTING
%================================================================
titleformat{chapter}[display]{%
  parskip=0pt
  fontsize{20}{24}selectfontbfseriescentering}{CHAPTER 
  thechapter}
  {0mm}
  {}
titleformat{section}
  {fontsize{14}{16.8}selectfontbf}
  {thesection.}
  {0.5em}
  {}
titleformat{subsection}
  {fontsize{13}{18.2}bf}
  {thesubsection.}
  {0.5em}
  {}
titlespacing{section}{0in}{12pt}{8pt}
titlespacing{chapter}{0cm}{0cm}{0cm}
titlespacing{subsection}{0in}{12pt}{8pt}
%================================================================
%         NAMES IN title/names_super
%================================================================
usepackage{lipsum}
begin{document}
  chapter{LONG CHAPTER THAT WILL CAUSE THIS ISSUE}
  lipsum
end{document}