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Select all the layers and and right click > Duplicate layers > New > save.
This doesn't seem to solve the problem as the new file also does not show a preview image.
I did notice, however, that most metadata also appeared to be gone (bridge reported no color profile,
or pixel dimensions for example). This suggested an alternative approach. I opened the original .dng
file again and then copied the layers from the damaged .psd per this suggestion. When saved, there was
a preview! However, it was only a preview of the base conversion. No matter what layers are visible when
the file is saved, the preview doesn't change. Still not right. I hesitate to continue to work with an obviously
Just an update:
This appears to be a bug, either in Photoshop or Bridge.
It seems to occur when there is a layer with a smartobject in the file (vector graphics from Illustrator, a copy of the image converted for use with a smart filter)
Delete the offending layer in the photoshop file and resave and all is well. The metadata is back, the image previews are there, everbody is happy.
Photoshop CC x64 14.2
Bridge CC x64 18.104.22.168
If the problem is in Bridge, purge the Bridge cache for that folder, which force it make new previews.