Block tags in overview.html are ignored

ADDITIONAL SYSTEM INFORMATION :
Fedora 33 / java version "15.0.2" 2021-01-19

Also does not work with latest Java-11

A DESCRIPTION OF THE PROBLEM :
Block tags in an overview file (such as "-overview overview.html") are not rendered.

REGRESSION : Last worked in version 8u281

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a small project with at least two packages and an overview.html. Write some text in overview.html and at the end add e.g. '@see "Somwhere else"'. Run javadoc.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Index.html should contain the information from the overview including a "See also" section.
ACTUAL -
The @see tag (and other block tags are dropped.



---------- BEGIN SOURCE ----------
I cannot insert the complete project tree here.
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
None.

The problem "starts" at jdk.javadoc.internal.doclets.formats.html.AbstractPackageIndexWriter.buildPackageIndexFile(String title, boolean includeScript) where (only) addOverviewComment ist called. While this might still add everything, it only adds the "fullBody".

FREQUENCY : always