Failure of release build with release.sh on 14-CURRENT amd64

Hello,

I tried release build with /usr/src/release/release.sh on 14-CURRENT
amd64 under followin conditions.

* 14-CURRENT amd64
* f17fc5439f5 + revert of 84eaf2ccc6a (Workaroud of the problem
  reported as bug 253087 on Bugzilla)
* No release.conf, everithing is default
* /scratch is empty when build starts
* /scratch/usr/doc is ba0831043d of main
* /scratch/usr/ports is r563439 of head
* /scratch/usr/src is 151ec796a23 of main
* devel/git is installed but devel/subversion isn't

And the result is failure with following error messages.

----------------------------------------------------------------------
cd /usr/doc/en_US.ISO8859-1/htdocs/releases/14.0R &&  env MAN4DIR=/usr/src/release/../share/man/man4  _BRANCH=CURRENT  make all install clean "FORMATS=html txt"  INSTALL_COMPRESSED='' URLS_ABSOLUTE=YES DOCDIR=/usr/obj/usr/src/amd64.amd64/
release/rdoc  WEBDIR=/usr/doc DESTDIR=/usr/obj/usr/src/amd64.amd64/release/rdoc
cd: /usr/doc/en_US.ISO8859-1/htdocs/releases/14.0R: No such file or directory
*** Error code 2

Stop.
make[1]: stopped in /usr/src/release
*** Error code 1

Stop.
make: stopped in /usr/src/release
----------------------------------------------------------------------

Full buld log is

https://www.utahime.org/FreeBSD/release.sh.2021-01-31-09-10-35.log

(Caution: Size of the file is about 75MB)

Does this mean that release.sh is simply broken right now or I did
something wrong?

Best Regards.

---
Yasuhiro Kimura