UpToDate states that la belle indifference, which is taught on board materials as classically associated with conversion disorder, is in fact NOT specific to conversion disorder at all.
They write "La belle indifference, which refers to an incongruous lack of concern (indifference) about significant symptoms, has no validity in discriminating functional neurological symptom disorder from recognizable neurologic disease. In a systematic review of 11 prospective or retrospective studies, the median frequency of la belle indifference was comparable for patients with functional neurological symptom disorder (n = 356) and patients with defined neurologic disease (n = 157; 21 versus 29 percent). In our experience, la belle indifference often indicates that patients are trying to appear brave or cheerful in the presence of actual distress (to avoid receiving a psychiatric diagnosis such as depression), or may less often suggest factitious disorder."
Source: Other - https://www.uptodate.com/contents/functional-neurological-symptom-disorder-conversion-disorder-in-adults-clinical-features-assessment-and-comorbidity?search=conversion%20disorder&source=search_result&selectedTitle=1%7E66&usage_type=default&display_rank=1#H13158838
Favoring boards knowledge; would need support from boards resource like AMBOSS/UW