Creating reference typed variants of several value type-only components causes crashes

[Zyzyl]

Describe the bug

Attempting to create or interact with reference typed variants of several different components which should only accept a value type causes crashes.

Relevant issues

#724, #1230 - both fixed. Possibly others too.

To Reproduce

Attempting to create any of the following via the Add Component dialog with the Slot type will immediately freeze and then crash Neos.

• ValueProxy<T>
• SetValue<T>
• ValueRadio<T>
• ButtonValueCycle<T>
• ButtonValueSet<T>
• ValueOptionDescriptionDriver<T>
• ButtonRelay<T>

Attempting to create a ValueMultiplexer<Slot> happens successfully, however Neos freezes and crashes if you press the 'Add' button.

Attempting to create a (UIX) Slider<Slot> crashes the session.

It is also possible to create a ValueDriver<Slot>, this seems benign but I don't think it's functional (I couldn't drag and drop references into the fields).

Expected behavior

It shouldn't be possible to instantiate reference typed variants of these components, similar to how one cannot for e.g. ValueField<T>.

Bug information (please complete the following information):

• Neos Version: 2021.3.16.1287
• Neos Platform: Windows

Reporters:

Zyzyl#1441
Banane9#5929 noted the ValueProxy issue in Discord which prompted me to look for others

[Frooxius]

We already have report for this here: #1852 It's a general issue, I have a fix coming in the next build.

[Frooxius]

Ah nevermind, this is actually different for some of them, sorry, some of them were missing checks in the first place! Fix coming too for those.

[Frooxius]

Added validation to all these in 2021.3.23.231, thanks for the findings!