Build not working on Unity version 2020.2.7f1

[sampjh]

When building the Crash demo project (this also happens with the other 'ready to build' scenes) certain files are missing after the build, resulting in an error.
Files missing after build: UnityLoader.js, the json file and markersImages folder.

there is also a difference between the 'markers' folder between Unity versions,
the build from the 2019.4.15f1 build contains Hiro.patt, Nutty.patt and NuttyCardboard.patt.
the build from the 2020.2.7f1 build contains patt.hiro and test.patt

when building in Unity 2019.4.15f1 everything works as it should.

[afzaale01]

Any update on it @sampjh ?