False negative in UnusedImportCheck

[mahfouz72]

detected at #14548 (comment) and #14548 (comment)
I have read check documentation: https://checkstyle.sourceforge.io/checks/imports/unusedimports.html
I have downloaded the latest checkstyle from: https://checkstyle.org/cmdline.html#Download_and_Run
I have executed the cli and showed it below, as cli describes the problem better than 1,000 words

PS D:\test> cat src/Test.java                                                  


import java.util.List; // expected violation here but there is no violation

/**
* @link List               // invalid link
*/ 
class Test{

}

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
          "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
          "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">

<module name="Checker">
    <property name="charset" value="UTF-8"/>

 <module name="TreeWalker">

      <module name="UnusedImports"/>
    </module>
</module>
PS D:\test> java  -jar checkstyle-10.13.0-all.jar -c config.xml  src/Test2.java
Starting audit...
Audit done.

Describe what you expect in detail.

This is an invalid Link because there is no { } so the check should Ignore this and It shouldn't be considered as usage So we should have a violation on import java.util.List;

the reason for that may be because we use javadocUtil and this util is based on regular expression parsing not javadoc AST

checkstyle/src/main/java/com/puppycrawl/tools/checkstyle/utils/JavadocUtil.java

Line 121 in 8531fec

if (JavadocTagInfo.isValidName(tag.getName())) {

another example:

/**
* @link {Collections::emptyEnumeration}               // invalid link
*/ 

the above link also is considered a valid link as it has a valid tagName but it shouldn't be valid. for a method reference to be a valid link it has to be like this : @link {Collections#emptyEnumeration}