The header bar of Timeless hides map navigation buttons, when a map is shown in a plain-screen.
Sample : https://fr.wikipedia.org/wiki/Pavillon_des_Indes?useskin=timeless#/maplink/0
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The problem is cased by timeless header bar z-index. It can be solved with CSS.
.mw-header-container, .mw-header-hack {
z-index: 1
}
Unfortunately not that simple. Also has to account for mw-header-nav-hack at some resolutions, which in turn has to account for sidebar navigation elements that are overlayed on top of this, and out of dom order.... This area is a bit messy and probably requires some attention, to make it less fragile.
Is this also causing T181167: Slight conflict between 2017 WTE and Timeless top-bars?
Also happens for example when editing template and using Template documentation editor dialog - top part (which contains "Done" button) is hidden behind Timeless nav header.
This is now resolved with the fix for T183284. All OOUI dialogs display on top of the normal Timeless header.
The fix is not yet deployed to production wikis, but you can verify it on beta: https://en.wikipedia.beta.wmflabs.org/wiki/Map?useskin=timeless#/map/0