1 item (1 fix)
ScreenPanel.ZIndex defaults to 100 (not 0), so any ScreenPanel that never sets a tier collides with the tier most projects author their modals at — and two roots with equal ZIndex have no defined paint order at all. Cross-root compositing is a stable OrderBy over an unordered HashSet, so tied roots keep an enumeration order that matches creation on a fresh boot but re-rolls on any enable/disable interleave or editor hotload. A full-screen surface can paint a perfectly healthy tree and still be invisible under a tied root.
Want to know when new guides or fixes drop? Join the community to help build this out. Report gotchas, flag outdated fixes, or just lurk.