Regression 2.15.0: NullPointer exception parsing file with @JsonCreator and ignore unknown properties

[dhs3000]

Describe the bug
A NullPointerException occurs parsing a (YAML) file to a Kotlin class. The object is created using a @JsonCreator that does not use all properties in the file.

Version information
2.15.0

To Reproduce
Have a data class SomeTaskListClass with a property that is a list of another class Task. The Task class has a @JsonCreator annotated static method to create it. It does not need/mention all properties of the file. The parser is configured to ignore those fields.

Parsing results in this error

com.fasterxml.jackson.databind.JsonMappingException: Cannot invoke "com.fasterxml.jackson.core.JsonParser.streamReadConstraints()" because "p" is null (through reference chain: SomeTaskListClass["tasks"]->java.util.ArrayList[0])
(...)
Caused by: java.lang.NullPointerException: Cannot invoke "com.fasterxml.jackson.core.JsonParser.streamReadConstraints()" because "p" is null
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handlePolymorphic(BeanDeserializerBase.java:1749)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:541)	

The line casing the error in handlePolymorphic is

JsonParser p2 = unknownTokens.asParser(p.streamReadConstraints());

a few lines later is a null check for p.
Looking at the call-site in _deserializeUsingPropertyBased, that NPE makes sense

return handlePolymorphic(null, ctxt, bean, unknown); // <-- passing null for `p`

Expected behavior
Parsing works without error.

[pjfanning]

duplicate of #3913