Feel this is related to this issue but let me know if you want a separate issue raised instead (or if it isn’t an issue!). We’re currently using fd2b2eb7e28463ed26847f1ff347f3ef583958e4 (“Bring back fullscreen mode and add expansed mode”) and can confirm disabling of reference dropdown and list editors is working as expected for us. However I tested a few other field types and editors and some still seem to be enabled:
References field - Checkboxes editor
References field - Input editor
Currently building a base image against latest master so I can check if these issues have been fixed in one of the many changes since build I tested against.