NullReferenceException in MS.Internal.PrePostDescendentsWalker`1._VisitNode

### Description

A NullReferenceException can occur in MS.Internal.PrePostDescendentsWalker`1._VisitNode when System.Windows.TreeWalkHelper.InvalidateOnTreeChange is called after a logical/visual tree change.

### Reproduction Steps

Unclear how this exception occurs, but has something to do with resource lookups on an element that is no longer in the logical tree.

### Expected behavior

No null reference exception occures internally. Rather no null reference is passed or an exception is thrown highlighting the root cause.

### Actual behavior

A NullReferenceException goes unhandled

### Regression?

_No response_

### Known Workarounds

_No response_

### Impact

_No response_

### Configuration

_No response_

### Other information

_No response_