Reproduce:

• goto migration, select process definition with instances that contain variables that are not strings
• goto select instances screen
• add query to only list instances that have a certain value for the non-string type variable

Expected:

• only instances matching to the query are shown

Observed:

• no instances are shown

Hint:

• migration currently uses the GET method to retrieve the list of instances. This only supports strings
• to fix this issue, migration has to use POST method (support for that has to be added to the JS SDK)