Don't display active datestamps in time grid section

I have some `TODO` items with active datestamps without `SCHEDULED: ` keyword. I'm using this when I want to specify date ranges like this:

```org
* TODO foo
<2022-01-30 Sun>-<2022-02-01 Tue>
```

I don't want these items to be included in the time grid section because they don't have _times_, just _dates_.

In the classic agenda views, this works. These items are sorted normally among all other non-timed items.

However, in `org-super-agenda` mode, these items are included in the time grid section.

I use the following config:

```elisp
(setq org-super-agenda-groups
'((:name "time" :time-grid t)
(:name "overdue" :scheduled past :time-grid t)
(:name "prio" :auto-priority)
(:name "rout" :tag "rout")
(:name "work" :tag "work")
(:name "privat" :tag "privat")
(:name "method" :tag "method")))
```

Is there a way to specify that the time grid should only include items with _times_, not these date-based ones?

EDIT: Sorry, just discovered that there is indeed a closely related open issue: #204. Feel free to close or delete my issue here. Had not found this other one before despite searching for quite a while.