[gallery] not exactly preserved

Plugins I have enabled:
Preserved HTML Editor Markup
PS Disable Auto Formatting

(if having each one activate alone, the preserving doesn’t happen), with both activated, it almost work, except where there is [gallery] shortcodes.

It happens everytime, when I have gallery stuff in text editor – notice it only applies <p> around [gallery] shortcodes:

<h3>Pictures</h3>
<!-- 4 -->
<p>[gallery link="file" columns="4" ids="1863,1808,1794,1792"]
[gallery link="file" columns="4" ids="1861,1585,1759,1799,1779,1907,1768,1767,1785,1795,1763"]
[gallery link="file" columns="4" ids="1851,1827,1597,1586,1673,1689,1599,1802,1619"]
[gallery link="file" columns="4" ids="1876,1782,1752,1749,1766,1750,1776,1771"]</p>

<!-- 8 -->
[gallery link="file" columns="4" ids="1876,1782,1752,1749,1766,1750,1776,1771"]
[gallery link="file" columns="4" ids="1876,1782,1752,1749,1766,1750,1776,1771"]
[gallery link="file" columns="4" ids="1876,1782,1752,1749,1766,1750,1776,1771"]
[gallery link="file" columns="4" ids="1876,1782,1752,1749,1766,1750,1776,1771"]

When I switch to Visual tab and go back to text editor it becomes:

<h3>Pictures</h3>
<!-- 4 -->
<p>[gallery link="file" columns="4" ids="1863,1808,1794,1792"]</p><p>
</p><p>[gallery link="file" columns="4" ids="1861,1585,1759,1799,1779,1907,1768,1767,1785,1795,1763"]</p><p>
</p><p>[gallery link="file" columns="4" ids="1851,1827,1597,1586,1673,1689,1599,1802,1619"]</p><p>
</p><p>[gallery link="file" columns="4" ids="1876,1782,1752,1749,1766,1750,1776,1771"]</p>

<!-- 8 -->
<p>[gallery link="file" columns="4" ids="1876,1782,1752,1749,1766,1750,1776,1771"]</p>
<p>[gallery link="file" columns="4" ids="1876,1782,1752,1749,1766,1750,1776,1771"]</p>
<p>[gallery link="file" columns="4" ids="1876,1782,1752,1749,1766,1750,1776,1771"]</p>
<p>[gallery link="file" columns="4" ids="1876,1782,1752,1749,1766,1750,1776,1771"]</p>

Any idea then?

https://wordpress.org/plugins/preserved-html-editor-markup/