AttributeConverted sometimes does not work in Hibernate 6.

I have this repository:

The exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.math.BigDecimal] to type [cz.tconsult.problem.MyNumber] for value [579], is throwen by spring. But it is throwen, because the Hibernate does not call in the second method the MyNumberAttributeConverter.
The first method works and the MyNumberAttributeConverter is called.
The differece between these methods are only in the query. The failing query has some expression in the select clause.

The same construction worked in hibernate 5 (springboot 3).

The attachement contains small application with demonstrating tests.