Since installing the 1803 update, Windows File Explorer doesn't display the correct folder size if the folder is named 'Applications'.
There seems to be a bug that if the folder name is 6 characters or more and starts with 'Appli', the folder size shows significantly less than it actually is. For example if the folder is named 'Apps' or 'Appli', it will display the size correctly. If however it is named 'Applications' or 'Applix' or 'Appliy', then it won't display correctly.
The Feedback app doesn't work on my computer due to having telemetry settings set to 'Basic', therefore I am reporting the bug here instead.
Windows 10 Pro X64 (17134.1, 1803)