In order to display the 2D data in a web browser or to do the distance, area and volume computations, there are some coordinate system transformations that have to be applied to the ortho, DSM, annotations and GCPs (in case of using AutoGCP functionality).
Important work has been done to improve the way these transformations are done to be able to use the most updated coordinate system transformation libraries and to avoid some edge cases with some coordinate systems where the 2D and 3D annotations were not perfectly aligned.
All conversions are now using proj7 which guarantees the highest accuracy in the data that is displayed and the computations that are done in the editor.