Nextcloud, tasks : can't copy/paste from framagenda to any nextcloud-based server

hello

im running thunderbird on debian
i use several agenda providers, framagenda plus two others nextcloud

i appreciate that it permits me to copy/paste différents schedules, as i systematically copy any element to the 2 others providers. It avoid me to lost my calendar, as it happened in 2021 with linuxfabrik (hopefully only 2 months).

So i have :

  • 1 nextcloud based agenda service
  • 1 another nextcloud agenda based services
  • 1 framasoft service

all are free to provide those lightweight data, such as agenda, etc.

But.
On thunderbird,
for events : if i can copy/paste well an event from an agenda to another one (a provider to another one), it works
for tasks , it’s different from nextcloud’s based ones : it doesnt process a copy/paste from eg framagenda (or mailo calendar) to a nextcloud’s based agenda. Only events looks like able to copy/paste (on any type of server), not tasks (from framagenda to NC).

Eg i did the test :
with a task hosted on framagenda service, i can copy it to eg mailo agenda. But i can’t on any nextcloud’s based agenda.

it surprised me, i dont know why…

does anyone encountered a such situation?

thank you