bisect does not respect 'log.date'

Folks,

I am running git version 2.43.0 and consider the following config:

$ git config --system --list
core.eol=native
log.date=iso-strict
color.ui=auto

So date output looks fine with 'log' and 'show':

osipovmi@deblndw011x:~/var/Projekte/tomcat-native ((ba1454e15...)|BISECTING)
$ git log
commit ba1454e15619a44fe66d86f59c766c0cc25323eb (HEAD)
Author: Mark Thomas [off-list ref]
Date:   2024-02-13T08:27:43+00:00

    Fix link

and

osipovmi@deblndw011x:~/var/Projekte/tomcat-native ((ba1454e15...)|BISECTING)
$ git show HEAD^
commit ef40b6d00c4bdaa23960b5dc0eaac28cce758d29
Author: Mark Thomas [off-list ref]
Date:   2024-02-06T16:40:25+00:00

    Update minimum APR version in a few more places

now let's bisect:

osipovmi@deblndw011x:~/var/Projekte/tomcat-native (apache-1.3.x =)
$ git bisect start HEAD HEAD~4
Binäre Suche: danach noch 1 Commit zum Testen übrig (ungefähr 1 Schritt)
[ef40b6d00c4bdaa23960b5dc0eaac28cce758d29] Update minimum APR version in a few more places

...fast forward

osipovmi@deblndw011x:~/var/Projekte/tomcat-native ((ba1454e15...)|BISECTING)
$ git bisect bad
ba1454e15619a44fe66d86f59c766c0cc25323eb is the first bad commit
commit ba1454e15619a44fe66d86f59c766c0cc25323eb
Author: Mark Thomas [off-list ref]
Date:   Tue Feb 13 08:27:43 2024 +0000

    Fix link

 xdocs/news/project.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

The config for date format is ignored. Is uses the default value.

An oversight or bug?

Michael