Unable to start review

Hi,

Thanks for taskwarrior + tasksh, it's a life saver for my brain :)

I'm seem to be running into an issue where the initial set-up of the review command does not work.
Unfortunately I'm not sure how to go about debugging this.

I've installed taskwarrior + tasksh via nix home-manager. tasksh itself seems to run fine, I'm able to add/remove/update tasks.
It's only the review command that does not work:

```
tasksh 1.2.0

Commands:
tasksh> list Or any other Taskwarrior command
tasksh> review [N] Task review session, with optional cutoff after N tasks
tasksh> exec ls -al Any shell command. May also use '!ls -al'
tasksh> help Tasksh help
tasksh> diagnostics Tasksh diagnostics
tasksh> quit End of session. May also use 'exit'

Run 'man tasksh' from your shell prompt.
Run '! man tasksh' from inside tasksh.

tasksh> count
[task count]
92
tasksh> review
Tasksh needs to define a 'reviewed' UDA of type 'date' for all tasks. Ok to proceed? (yes/no) yes
Tasksh needs to define a '_reviewed' report to identify tasks needing review. Ok to proceed? (yes/no) yes

There are no tasks needing review.

tasksh> review
Tasksh needs to define a 'reviewed' UDA of type 'date' for all tasks. Ok to proceed? (yes/no) yes
Tasksh needs to define a '_reviewed' report to identify tasks needing review. Ok to proceed? (yes/no) yes

There are no tasks needing review.

tasksh> count
[task count]
92
tasksh> version
[task version]

task 2.6.1 built for Linux
Copyright (C) 2006 - 2021 T. Babej, P. Beckingham, F. Hernandez.

Taskwarrior may be copied only under the terms of the MIT license, which may be found in
the Taskwarrior source kit.

Documentation for Taskwarrior can be found using 'man task', 'man taskrc', 'man
task-color', 'man task-sync' or at https://taskwarrior.org

tasksh>
```

Could you give me some hints?

Thanks