Steps to Reproduce:
1. Modifying [[ https://commons.wikimedia.org/wiki/File:Coat_of_arms_of_Portugal_(Lesser).svg | File:Coat of arms of Portugal (Lesser).svg ]] just by adding two additional elements
2. Upload as [[ https://commons.wikimedia.org/wiki/File:Coat_of_arms_of_Portugal_(Lesser_with_field).svg | File:Coat of arms of Portugal (Lesser with field).svg ]]
Actual Results:
The three blue shields in the center missing in PNG preview, thay are <use> elements, but they are refering another <use> elements via xref attribute.
These images also affected: [[ https://commons.wikimedia.org/wiki/File:Coat_of_arms_of_New_Zealand.svg | File:Coat of arms of New Zealand.svg ]], [[ https://commons.wikimedia.org/wiki/File:Crowned_Arms_of_New_Zealand.svg | File:Crowned Arms of New Zealand.svg ]], [[ https://commons.wikimedia.org/wiki/File:New_Brunswick_coat_of_arms.svg | File:New Brunswick coat of arms.svg ]]. I've made workarounds to avoid this problem, and you can see my efforts in their File History section respectively, but I don't want to pay so much times any more to do such things.
Expected Results:
The three blue shields in the center should be redering in PNG preview, without any modification.