October 23, 2020, see blog at https://www.percona.com/blog/2020/10/23/mysql-new-releases-and-percona-xtrabackup-incompatibilities
do you already have a date for the XtraBackup 8.0.22-15 release?
XtraBackup 8.0.22-15 was released on 2020-12-14, so this thread can be closed.
$ xtrabackup --version
xtrabackup version 8.0.22-15 based on MySQL server 8.0.22 Linux (x86_64) (revision id: fea8a0e)
https://www.percona.com/doc/percona-xtrabackup/8.0/release-notes/8.0/8.0.22-15.0.html
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