Can't create daily note and append to heading in one step

[mfloreen]

Thanks for your work on this useful plugin, @Vinzent03.

My daily notes all start with a template from the core Templates plugin, which includes a heading for "Reading Notes." I've been using the following URI as part of a shortcut on iOS to add text under that heading:
obsidian://advanced-uri?vault=<vault>&daily=true&heading=Reading%20Notes&data=<text>&mode=append&viewmode=source

If the daily note already exists, it works beautifully. However, if the daily note hasn't been created yet, nothing happens.

If I use the same URI without the heading=, it also works, creating a daily note and appending text to the bottom. But when I try to create a daily note and append to a heading at the same time, it consistently fails.