Servoy Default (legacy) components are now depricated and not shown by default. These components are only shown when the form already has some of these components,
or in the preferences under Default Packages the checkbox "Show always default/legacy servoy components in designer (if enabled above)" is checked.
A warning is not now generated if you use none valid names for forms or components in the solution model
The same validator that is used in the developer itself is not used ot validate the name of your form or component.
So doing something like: solutionModel.newForm("form_" + application.getUUID().toString()); will result in such a warning because a uuid has '-' in its string.
Make sure you replace all those chars (like '-') to '_'. In certain parts of servoy using illegal names could result in weird behavior.