Solr 7(.5.5) -> Solr 8(.8.2) , different non-emptyness query behavior?

[clemens...@mysign.ch]

I have a unit test that tests the "non-emptyness query". As of updating from 
7.5.5 to 8.8.2 this very test fails and returns a document that has an empty 
string ( i.e. "" )
The "non-emptyness query" is:
fieldName:[* TO *]

Has the default "behavior" of the above query changed?

Does it possibly have anything to do with 
RemoveBlankFieldUpdateProcessorFactory?

Additional note: so far I haven't made any chages to the solrcofig.xml, so I am 
still using the same configuration as for 7.5.5

Regards
Clemens