Return of emoji / utf8mb4 error in Palm - /api/edx_proctoring/v1/user_onboarding/status issue?

In the end I solved this (hackishly) by editing
.local/lib/python3.10/site-packages/tutor/templates/apps/openedx/config/partials/auth.yml
and removing some sort of conditional it had

      {%- if RUN_MYSQL %}
      charset: "utf8mb3"
      {%- endif %}

and replacing that with just

      charset: "utf8mb4"

(This being under the DATABASES → default → OPTIONS heading)

This doesn’t really make sense still though, as to why it works with no change my beta Palm platform and it doesn’t work on the production Palm patform. My .local/share/tutor/config.yml has RUN_MYSQL: false in both cases…