The value displayed is 0 instead of NULL

[Zazimut]

What is the bug or the crash? What were your expectations and what actually happened?

When a NULL value is set from an expression, the display of this value is 0 but is considered like a NULL value for other calculated fields. It appear with Shapefiles and Geopackages in the same way

Steps to reproduce the issue

_ Set a field with the checkbox tool (field1)
_ Set a field2 with a default value like : IF("field1" = 'False', NULL, "field2")
_ Enter a value in the field1
_ Change the value on 'False' in the field2
_ The value displayed for field1 should be 0 and not NULL (but considered as NULL)

Version

3.5.3-Fangorn

Operating system name

Android

Operating system version

Android 10 QP1A.190711.020

Reinstall QField

• I have a fresh install of the latest QField version, but the problem persists.
• Problem can be reliably reproduced, doesn't happen randomly.
• Problem happens with all files and projects, not only some files or projects.

Additional context

No response

[m-kuhn]

Can you provide a minimal project which demonstrates the problem?