The "More details on Wikimedia tooltip", which appears when hovering over the Commons icon in the bottom bar has suboptimal placement in both LTR and RTL languages.
In LTR languages its arrow is not exactly at the Commons icon itself. For an example see:
In RTL languages it goes off screen to the left and causes a horizontal toolbar to appear. For an example see:
In both cases hover over the Commons icon. Notice that it's on the bottom left side in the RTL wiki.