It seems that the tendency to adjust appraisals of ourselves in the past and future in order to maintain a favourable view of ourselves in the present doesn't require episodic memory

Getting Better Without Memory. Julia G Halilova, Donna Rose Addis, R Shayna Rosenbaum. Social Cognitive and Affective Neuroscience, nsaa105, July 30 2020. https://doi.org/10.1093/scan/nsaa105

Abstract: Does the tendency to adjust appraisals of ourselves in the past and future in order to maintain a favourable view of ourselves in the present require episodic memory? A developmental amnesic person with impaired episodic memory (H.C.) was compared with two groups of age-matched controls on tasks assessing the Big Five personality traits and social competence in relation to the past, present, and future. Consistent with previous research, controls believed that their personality had changed more in the past five years than it will change in the next five years (i.e. the end-of-history illusion), and rated their present and future selves as more socially competent than their past selves (i.e. social improvement illusion), although this was moderated by self-esteem. Despite her lifelong episodic memory impairment, H.C. also showed these biases of temporal self-appraisal. Together, these findings do not support the theory that the temporal extension of the self-concept requires the ability to recollect richly detailed memories of the self in the past and future.

Keyword: episodic memory, self-appraisal, developmental amnesia, case study, end-of-history illusion, social improvement illusion