Memory leaks observed when profiling Windows Presentation Foundation (WPF) applications
Published 14 May 2018
When profiling some applications based on the Windows Presentation Foundation (involving controls with collapsed visibility), the private bytes count may increase continually and never decrease.
This is caused a known bug in WPF for which Microsoft has released a hotfix. For more information, see Microsoft Knowledge Base article 967328. You can find a full description of the issue on Ramon de Klein's blog.