Disappearing box borders in PDF on “tcolorbox”, but stable borders on mdframed. Possible make such borders in tcolorbox?

Question

Lets consider two silimar boxed environments using mdframed and tcolorbox, processed by xelatex/pdflatex:

\documentclass{article}
\usepackage{tcolorbox}
\usepackage{mdframed}
\usepackage{lipsum}

\begin{document}
\begin{tcolorbox}[colback=white,colframe=black,sharp corners=all,boxrule=0.7pt,top=0.2in]
\lipsum[3]
\end{tcolorbox}

\begin{mdframed}[linewidth=0.7pt,innertopmargin=0.2in,innerbottommargin=0.2in]
\lipsum[3]
\end{mdframed}

\end{document}

On zoom 100% or greater we see two equivalent boxes in all PDF viewers (Evince, Okular, Adobe Acrobat, …)

But on zoom below 75% tcolorbox starts to loose frame borders on Okular and Adobe Acrobat.

Yes, questions already discussed [Box border lines not showing properly on PDF ], (about incorrect rasterization in Evince, guilty PDF viewers, etc).

But I see, that mdframed hacked somehow this problem and "mdframed borders" OK in all PDF Viewers (even without "[framemethod=tikz]").

Is it possible to specify some magic options/hack/workaround to make tcolorbox behave "like mdframed"? ("save borders in all zoom levels even in Okular and Adobe Reader")

Answer 1

The problem with tcolorbox is a mess with rasterizing both borders and fill background (thanks @DavidCarlishe). We need transparent background in tcolor box.

Corrected source:

\documentclass{article}
\usepackage{tcolorbox}
%\tcbuselibrary{skins}
\usepackage{mdframed}
\usepackage{lipsum}

\begin{document}
\begin{tcolorbox}[standard jigsaw,opacityback=0,colframe=black,sharp corners=all,boxrule=0.7pt,top=0.2in,left=0.1in]
\lipsum[3]
\end{tcolorbox}

\begin{mdframed}[linewidth=0.7pt,innertopmargin=0.2in,innerbottommargin=0.2in]
\lipsum[3]
\end{mdframed}

\end{document}

OK with all zoom levels in Okular and Adobe Acrobat.