Questionmark not properly parsed

[prkwcz]

Version: 3.1

Bug Description

In the previous versions, a query was possible as follows:
$db->fetchAll("SELECT A FROM B WHERE C IS NULL AND ?", ['D' => 'E']);
Since 3.1 this is no longer possible, no results are displayed (although the manually generated SQL statement returns results).

Steps To Reproduce

in 3.07:
$db->fetchAll("SELECT A FROM B WHERE C IS NULL AND ?", ['D' => 'E']);
in 3.1:
$db->fetchAll("SELECT A FROM B WHERE C IS NULL AND ?", ['D' => 'E']);

Expected Behavior

It would be expected that under 3.1 the statement would also deliver results.
In this simple example, it does not make much sense to use the questionmark, but there are complex queries where it is very helpful to use it as described above.