linkprop not working as expected when linking Position of uiimage to Position of uipanel with uiaxes

Here's the issue I'm having:

fig=uifigure( ...
    'Position',[100,100,300,300]);
img=uiimage(fig, ...
    'Position',[51 51 100,100], ...
    'ImageSource',zeros(100,100,3));
pan=uipanel(fig);
hLink=linkprop([img,pan],'Position');

This figure behaves as expected when resizing. The image moves but stays the same size, and the panel stays on top of the image. This is the behavior I want.

% After manually resizing the uifigure

>> img.Position
ans =
    11    51   100   100
>> pan.Position
ans =
    11    51   100   100

However, after adding an axes to the panel, the dominance of the objects with regard to the proplink appears to flip.

ax=uiaxes(pan);
    
% After manually resizing the uifigure

>> img.Position
ans =
    51    51   411   100
>> pan.Position
ans =
    51    51   411   100

Instead of the image and panel maintaining a constant size, both begin to be automatically resized by the resizing of the uifigure.

I can create a workaround for my specific case using uifigure callbacks, but I would rather avoid that if possible. Can someone explain what is going on here and what I can do to get the behavior I want?