From the Actionable tab, click on the + to create a new task, with the following contents:

parent

- child1
- child2

I see this in the Actionable tab:

which is not correct but that's a known problem - see #1039

After clicking on Open and back on Actionable:

Now click on the checkboxes to mark the children as done:

They don't disappear even though they should, but that's again #1039

After clicking on Open and back on Actionable again, parent is visible. Open it:

Click on Mark as Done - it becomes

Close task. It still looks undone

Let's blame the view again and click Open->Actionable. Now the children are undone again:

Notes:

• If you close the parent by clicking its textbox without opening the editor, it actually gets closed
• there may be a slightly simpler repro if you just stay on the Open tab
• I haven't actually reproed on master yet, but I have no doubt. This is my version:

GTG: 0.7-dev-20241206
Flatpak: 1.14.10
Snap: False
Display Name: wayland-0
Desktop: GNOME

lxml: True
caldav: True
Cheetah3: True
dbus-python: True
pdflatex: False
pypdftk: False