Events created offline, don't get synced after connection is established

[WhatDothLife]

What Happened

I created some events for my local CalDav calendar without any internet connection.

Expected Behavior

After connecting to the internet, I expected them to get synced to the server. That wasn't the case.

Steps to Reproduce

1. Turn off your wifi
2. Create a event for a CalDav-calendar
3. Connect to the internet
4. After some time, check your calendar server. You won't find anything

Platform Information

SYSTEM  type       gnu/linux
        config     x86_64-pc-linux-gnu
        shell      /bin/zsh
        uname      Linux 5.8.18-1-MANJARO #1 SMP PREEMPT Sun Nov 1 14:10:04 UTC 2020 x86_64
        path       (/home/$USER/.emacs.d/bin/ ~/.local/bin /usr/local/bin /usr/local/sbin /usr/bin /usr/bin/site_perl /usr/bin/vendor_perl /usr/bin/core_perl /usr/lib/emacs/28.0.50/x86_64-pc-linux-gnu)

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