Problem building a Debian package in AFS

I have two Debian servers: one is buster and one is bullseye. They both 
run the openafs-client service. When I run "gbp buildpackage mypackage" 
it completes successfully on both servers as long as the directory where 
I run "gbp" is _not_ in AFS. If I run "gbp" in an AFS directory it 
completes successfully on the buster server but fails almost immediately 
if run on the bullseye server.

The failed build output on the bullseye server looks like this:
-----------------
test2-bullseye:~/development/git/vemail> gbp buildpackage
dh clean
    dh_clean
gbp:info: Exporting 'HEAD' to 
'/afs/example.com/users/rlinxster/development/git/build-area/email-virtual-domain-tmp'
gbp:info: Moving 
'/afs/example.com/users/rlinxster/development/git/build-area/email-virtual-domain-tmp' 
to 
'/afs/example.com/users/rlinxster/development/git/build-area/email-virtual-domain-11'
gbp:info: Performing the build
Building with cowbuilder for distribution sid
I: using cowbuilder as pbuilder
dh clean
    dh_clean
dpkg-source: info: using source format '3.0 (native)'
dpkg-source: info: building email-virtual-domain in 
email-virtual-domain_11.tar.xz
dpkg-source: info: building email-virtual-domain in 
email-virtual-domain_11.dsc
I: Generated dsc will be overwritten by build result; not generating 
changes file
E: File not found: ../email-virtual-domain_11.dsc
gbp:error: 'git-pbuilder' failed: it exited with 1
-----------------

Here is my .gbp.conf (same on both servers):
-----------------
[DEFAULT]
builder = git-pbuilder
cleaner = fakeroot debian/rules clean
pristine-tar = True

[buildpackage]
export-dir = ../build-area/
tarball-dir = ..

[import-orig]
dch = False