Hello,
I was able to consistently recreate and then get past a small error and wanted to report it.
When you set Focal Length to something non-numeric like Double Exposure, your metadata will fail to export with a generic warning, as shown below.
Note that the export does succeed, but no keywords are set on the exported image.
If there are certain criteria over this field, is it possible to display it in the error? I’m assuming there’s an exception while calculating the 35mm equivalent focal distance. If this is the case, the 35mm equivalent field could be empty, instead of the entire metadata write failing.
I’m on MacOS using Lightroom Classic
If curious, the reason I set the metadata this way, I did a double exposure with multiple lenses 