Edit - sorry about that, the issue can be closed. The cause is actually on my side, it happens when using the yuicompressor.
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There is a css issue with the priority update within the admin ui.
When clicking the priority field of a content in the content list, it is possible to update it but in Chrome, the "validate" and "cancel" buttons appear on top of the priority field, making it impossible to actually change the value.
See attachment.

The issue seems to be coming from here: vendor/ezsystems/platform-ui-bundle/Resources/public/css/views/subitem/listitem.css:29

.ez-view-subitemlistitemview .ez-subitem-priority-buttons,
.ez-view-subitemlistitemview .ez-subitem-priority-icons (
display: none;
position: absolute;
top: -0.6em;
left: calc(100% + 0.5em);
z-index: 1;
)

The property "left: calc(100% + 0.5em);" isn't valid in Chrome.