An update (14.0.1) is now available for InDesign CC 2019. The update contains the fix for this issue.
Please install this update via the Creative Cloud application.
Adobe InDesign teamJames supported this idea ·James commented
Just spent all afternoon trying to replicate colour settings used on an existing job 2 weeks ago for a printer (supplied ICC profile from the printer using Indesign 2018). No matter what changes I made in the export PDF box, it produced the same incorrect results, that didn't match the previous set of PDFs.
The only fix was to export all my work as IDML files and make the PDFs using Indesign 2018.
Adobe, fix this, this could have cost us thousand with our printer for late files!!! Plus it also makes it look like we have no idea what we are doing.