Fix

scripts/install

@@ -162,6 +162,9 @@ chown -R $app: "$final_path" "$datadir"
 # picked up by Yunohost's auto-redact mecanism
 admin_password="$(ynh_string_random --length=6)"
 
+# Set the mysql.utf8mb4 config to true in config.php
+exec_occ config:system:set mysql.utf8mb4 --type boolean --value="true"
+
 # Install Nextcloud using a temporary admin user
 exec_occ maintenance:install \
     --database "mysql" --database-name $db_name \

scripts/upgrade

@@ -246,7 +246,7 @@ then
     exec_occ -V
 
     if [ "$(exec_occ config:system:get mysql.utf8mb4)" != "true" ]; then
-        exec_occ db:convert-mysql-charset
+        exec_occ maintenance:repair
     fi
 
     # Upgrade may fail if this app is enabled