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thumbnails going back to code =(

#1

I noticed that some of my notebooks had recently (?) reverted to “code thumbnails”, rather than the glorious graphics they had some time earlier.

Example https://observablehq.com/search?query=South%20Africa’s%20medial%20axis

Currently:
54

It used to be (google can attest to it)

In a more recent notebook such as https://observablehq.com/@fil/umap-a-personalized-distance-function, I’ve had to add a “static” mode in order to have a nice thumbnail — the worker version didn’t show up

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#2

This one seems to be back

However when I loaded the notebook here, a bunch of the cells were just red errors, which went away when I refreshed (I didn’t investigate the cause, sorry). So maybe something (e.g. external resource) failed to load when the thumbnail daemon tried to render it?

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#3

Puzzling! With an anonymous session the thumbnail is correct, but with my user @fil it’s incorrect. But there is no difference between the versions (i.e. the “Publish” button is not activated).

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#4

I believe this was due to the thumbnail process being slightly slow when loading and processing the notebook. If it still hasn’t rendered it all within a certain timeout, it’ll go ahead and look for canvas/svg/img’s and not find them and fallback to using a “code” version.

That being said, we just updated the process and I’ve anecdotally noticed it handling these cases better. So, I’m going to say this should be fixed now¹ and many more of your notebooks will gloriously thumbnail.

¹ Except those ones that for whatever reason intentionally take longer than 30s to render a graphic.

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