Valve and Respawn Entertainment forgot a comma in 'g_FieldTypes' causing "FIELD_INTERVAL" and "FIELD_MODELINDEX" to be concatenation. The engine executable patch fixes this problem
The documentation file for all patches applied to 'r5apex.exe' could be found in 'r5dev/resource/patch/r5apex.patch'. This is a text file containing the offset to the patch and its original instructions followed by the new instructions.