The nodes are probably just off-screen. The flow likely didn't vanish — the canvas is just panned away from it. Hit the "fit to view" button on the left toolbar (the crosshair icon), or drag around the empty space to find your nodes.
Could be a rendering glitch. Try a hard refresh (Ctrl+Shift+R), open it in an incognito window, or switch browsers.
Check Version history. Since you saved a draft, it should be recoverable there — open Version history in the top menu, pick your saved version, and it'll load back into the designer.
if this helped please mark it as verified! thank you in advance
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