InnoDB: Defragmentation of BASE_IDX in SYS_VIRTUAL failed: Data structure corruption

We have been running MariaDB 11.4.10 for some time against a several years old database. I noticed that even after enabling autoshrink, the `ibdata1` file which should be empty always remains at 12GB.

After updating to 11.4.12, I see in the error log:
```
InnoDB: Moving the data from extents 34304 through 786432
InnoDB: Destination extent range: 320 through 640
[ERROR] InnoDB: Defragmentation of BASE_IDX in SYS_VIRTUAL failed: Data structure corruption
```

```
root@localhost [(none)]> SELECT * FROM information_schema.innodb_sys_virtual;
Empty set (0.000 sec)
```