PDFs with certain Identity-H encoded fonts do not display in InDesign 2020 (Windows, v 15.1.2), but work fine in InDesign 2019.

The issue seems to be font encoding related – InDesign 2020 doesn’t like the Museo Sans 500 (and some other OpenType) fonts being embedded into the PDF using the Identity-H encoding. If the encoding is changed to ANSI encoding, then the PDFs render fine.

Preflighting the PDF shows the problem fonts as Type 0.

Conversion of the PDF using Acrobat to PDF/X appears to rebuild the PDF in such a way as InDesign is able to render it (although it increases the file size from 10Kb to 500Kb)