I see some updates about this in the version 7.4.1 and 7.4.2.

Do I have to update the Soledad theme only or Penci plugins too?

Same jqery error here with 7.4.0. It prevented the Add Media button to work.

Hi,

We are using the latest version of Soledad. The warnings are still there.

I have the same problems with 7.4.0 installed from zip file:

here is an example (libs-script.min.js):

/* theiaStickySidebar */
!function(i) {
    i.fn.theiaStickySidebar = function(t) {
        var o = {
            containerSelector: "",
            additionalMarginTop: 0,
            additionalMarginBottom: 0,
            updateSidebarHeight: !0,
            minWidth: 0
        };
        t = i.extend(o, t),
        t.additionalMarginTop = parseInt(t.additionalMarginTop) || 0,
        t.additionalMarginBottom = parseInt(t.additionalMarginBottom) || 0,
        i("head").append(i('<style>.theiaStickySidebar:after {content: ""; display: table; clear: both;}</style>')),
        this.each(function() {
            function o() {
                e.fixedScrollTop = 0,
                e.sidebar.css({
                    "min-height": "1px"
                }),
                e.stickySidebar.css({
                    position: "static",
                    width: ""
                })
            }
            function a(t) {
                var o = t.height();
                return t.children().each(function() {
                    o = Math.max(o, i(this).height())
                }),
                o
            }
            var e = {};
            e.sidebar = i(this),
            e.options = t || {},
            e.container = i(e.options.containerSelector),
            0 == e.container.size() && (e.container = e.sidebar.parent()),

(last line - from minified lib code)

2nd example (main.js):

    PENCI.masonry = function() {
        $(window).load(function() {
            var $masonry_container = $('.penci-masonry');
            if ($masonry_container.length) {
                $masonry_container.each(function() {
                    var $this = $(this);
                    $this.isotope({
                        itemSelector: '.item-masonry',
                        transitionDuration: '.55s',
                        layoutMode: 'masonry'
                    });
                });
            }
        });
    }

Hi there,

We are currently using Enable jQuery Migrate Helper as a temporary solution for the jQuery issues which came up on the recent Wordpress updates.

Most of warnings are come from Soledad theme/plugins. Are you working on this? Will it be solved before WP 5.6?