column and formula are seperated in the UI as two different lists and edits reorders mixed content into first columns then formula.

e.g. the following is valid and the sequence matters:

<property generated="never" lazy="false" name="name">
<column name="name"/>
<formula>x+y</formula>
<column name="something_else"/>
</property>

but if I edit e.g. column name in structured editor I get:

<property generated="never" lazy="false" name="name">
<column name="name"/>
<column name="something"/>
<formula>x+y</formula>
</property>

which is very different semantically.