Desktop Icons Have Disappeared

I’m running Manjaro Mate, and my desktop icons have now all disappeared completely. What is happening, why, and how can I fix it? (I tried going into “Mate Tweak” and turning “desktop icons” on and off, but that is not helping.)

(I asked about this problem 5 days ago, when the problem was still intermittent, but I got no replies. But now my desktop icons have disappeared completely and I’ve been unable to reinstate them at all.)

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