The fix for this issue is available in the latest update of InDesign version 15.0.3
Please update your InDesign application to this version to get the fix.
Adobe InDesign team
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This is a bug. I was able to export a "print quality" pdf with no downsampling, as usual, from an INDD 2-page file. But when I tried to export only one page of the exact same file, created as a different INDD doc, I got an empty white 5kb pdf. Restarted, cleared IDD preferences, restarted again, no luck.
Adobe, please fix it.