$ cd linux2x
$ ./apply-reverse.sh 
+ source ./functions.sh
+ cd ..
+ rm -rf linux2x-data
+ mkdir linux2x-data
+ cd linux2x-data
+ pijul init repo
+ cd repo
+ pijul fork Reverse
+ tar -xJf ../../linux2x/kernel/linux-2.0.40.tar.xz -C ../
+ tar -xJf ../../linux2x/kernel/linux-2.0.1.tar.xz --strip-components=1
+ pijul add -r -- arch COPYING CREDITS Documentation drivers fs include init ipc kernel lib MAINTAINERS Makefile mm modules net README Rules.make scripts
+ pijul record -am.
+ (( i=2  ))
+ (( i <= 40 ))
+ xzcat ../../linux2x/patches/patch-2.0.2.xz
+ patch -Esp1
+ pijul add -r -- arch COPYING CREDITS Documentation drivers fs include init ipc kernel lib MAINTAINERS Makefile mm modules net README Rules.make scripts
+ pijul record -am.
Error: Changestore error: An I/O error occurred when reading/seeking
$

I believe I just fixed this (I could reproduce, but can’t anymore), sorry for the delay.

This was due to extra features in the new zstd-seekable.