Looks like (on a sample of 2) folding the edge of the foil reservoir is a good idea after all. I think the UV is reflecting inside the solidified resin that creeps over the edge, which then sets everything solid for a millimetre or so. Unfortunately that was where Probe 9 was. It's got a bit of solidified resin on it:
I also accidentally drilled into the foil, which creates a hole. Which lets in the UV, and that sets too, encapsulating the probe. It got pulled out leaving a crater. The muck on the probe, and the resin build-up at the edge conspired to produce a wave of semi-set resin at the edge of the foil, which the probe duly swept into the print attempt, totally ruining it.
I don't know if the Vivid marker had anything to do with it or it was just attached resin, but one or the other insulated the tip of the probe. So when I tried again, with the next Z Touch the probe didn't stop and pile-drived into the slide.
I have straightened it, and will try soaking it in acetone to revive it. I have low hopes of success, and see more etching in my future.

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