Use current value in update pipeline when original value is not being tracked #32480
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Fixes #32168
The issue here is that when using changed/changing notifications, we don't store original values for non-key/index properties. However, in one path, the update pipeline is assuming that asking for original values is always safe since if there isn't one, then a current value is returned. However, this doesn't work if original values are never saved for a given property. In that case, we need to explicitly ask for a current value instead.