Is this a bug of `doveadm mailbox metadata set` with `-A` and `-s ""`

Dear all,

Recently i encountered an issue with `doveadm mailbox metadata set` (and `unset`) with either `-A` or `-F <path>`.

When i run `doveadm mailbox metadata set` for single user, it correctly generates content in `dovecot-attributes` file:

```
doveadm mailbox metadata set -u <email> -s "" "/private/vendor/vendor.dovecot/http-notify" "user=all"
```

But if i run with `-A`, or `-F <path>`, Dovecot generates incorrect "path" and unreadable characters in `dovecot-attributes` file:

```
# doveadm mailbox metadata set -A -s "" "/private/vendor/vendor.dovecot/http-notify" "user=all"
# for i in $(find . -name 'dovecot-attributes'); do echo $i; cat $i; done

priv/4898662293abe1690d9a000063130d18/vendor/vendor.dovecot/pvt/server/??????
user=all
priv/90e7b40fc8c1e9690924000063130d18/vendor/vendor.dovecot/pvt/server/vendor/vendor.dovecot/http-notify
user=all
priv/60ba353790c1e969f923000063130d18/vendor/vendor.dovecot/pvt/server/endor.dovecot/pvt/server/CV??
user=all
```

It's ok if i specify the mailbox in -s, for example: `-s "INBOX"`, `-s "Sent"`, but it's not what i want, because only emails delivered to specified mailbox will be pushed.

Is this a bug?
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