We’re also seeing this issue of some TextMeshPro texts not visible on non-M1 2019 model (but working fine on 2018 MacBook Pro):
Update:
Our issue was related to having 3D text objects and UI text objects sharing the same TMP font - resulting in the UI texts losing out. See TMPro text is not visible on a device
Note, for us, this did not occur with Mac OS 10.15.x to 11.2.1 but appears on 11.3 or higher and it appears to be device specific i.e. not a problem on a MBP 13" 2019 running 11.3.1, but is a problem on a MBP 16" 2019 running 11.3.1.