Some symbolic icons are not shown

[aldomann]

After the latest major update, some symbolic icons are broken (no idea why; the SVG files look fine to me). For some strange reason, they look like a square, like the edit-clear-symbolic in Nautilus:

After playing a bit with gtk3-icon-browser, I found that these icons are broken:

• [x] application-certificate-symbolic
• [x] audio-card-symbolic
• [x] computer-apple-ipad-symbolic
• [ ] display-projector-symbolic
• [x] edit-clear-symbolic
• [x] format-text-direction-ltr-symbolic
• [x] format-text-direction-rtl-symbolic
• [x] input-touchpad-symbolic
• [x] insert-image-symbolic
• [x] insert-link-symbolic
• [x] insert-object-symbolic
• [x] insert-text-symbolic
• [x] mail-send-symbolic
• [ ] media-removable-symbolic
• [x] tab-new-symbolic
• [x] touchpad-disabled-symbolic
• [x] weather-severe-alert-symbolic
• [x] zoom-fit-best-symbolic
• [x] zoom-original-symbolic
• [x] zoom-out-symbolic