Steps to reproduce the issue

When following the documentation to create a custom content plugin to add fields to Joomla-articles:
https://docs.joomla.org/Adding_custom_fields_to_core_components_using_a_plugin
There is one pitfall: The attribs-field is a varchar with a length of about 5000.
If you add a couple of editors (maybe you have different page-types with long text (more than 5000 chars) in multiple columns / positions, then the attribs get cut.

Expected result

The content should be displayed, regardless if it is longer or shorter than 5000 characters

Actual result

Content is not being displayed correctly

System information (as much as possible)

Joomla 3.x, Php 5.6, Mysql 5.x
Does not depend on system

Additional comments

I solved the issue by manually changing the field type from varchar to text (not quite a clean solution, because it can be reverted on update..).
I recommend changing it by default to text in the next release if possible.