What the bug is:
When entering a default value for a custom block, most numbers once set show up like below:
A default value of five for a number input:
However, when entering zero in, the " = 0" does not appear:
Although, the zero does appear in the palette:
This behavior is different when using a text input, where the zero is shown in the editor:
How to trigger it:
Create a custom block, and set an input to be a number input, with a default value of zero.
Your browser/computer (eg. Chrome on Mac OS X):
I am using Firefox on a Windows 10 ThinkStation PC.
When you saw this bug (the date or Snap! version are equally helpful):
I have seen this bug today, and in the most recent version of snap (9.2.14).
I can send a project link if this is not reproducible.