Steps to reproduce the error

1. - Create the following class :
   Test.java

   public class Test {
   
       /**
        * The s property.
        *
        * @deprecated don't use it
        */
       private String s;
   }

2. - Enable javadoc formatting in Global Code Style settings
3. - Reformat. Notice that the tag is gone ! It seems to only happen with the @deprecated tag.

Workaround

Add some text on the line just above the tag makes it stay.

NB : I have marked this issue as Extreme because it deletes an extremely important information from the code.