I have a bit of a curiosity. I run a local nextcloud where I am doing my calendar and todo lists with the default nextcloud apps respectively. I have my thunderbird on my laptop and jtx broad on my phone to sync with it. I noticed once when making a todo item over the webclient directly on the nextcloud that they do not support (I searched and found there isn’t just a hidden setting).
I have not had any issues so far making recurring tasks with the clients. I am just curious if the community knows of any pitfalls that are not obvious that might cause a task to be lost or something.
I use baikal and sync between linux computers and iphone reminders app. I prefer making the todos on my iphone as it can guess the due date making it much faster than thunderbird.