class 'OpenlayersDrupal' not found while requesting update.php

Problem/Motivation

After installing the latest 7.x-3.x-dev version, requesting "update.php" results in the message:

Fatal error: Class 'OpenlayersDrupal' not found in /var/websites/vmsarl.monnerat.net/drupal/modules/openlayers/src/Config.php on line 46

I had no choice but reinstall the previous version (7.x-3.x-dev with timestamp 1622136789=May 27, 2021, uses service_container).
My PHP version: 5.5.26
My OL js: 5.0.0

Steps to reproduce

• install the latest 7.x-3.x-dev version
• submit http://server/update.php

Proposed resolution

None: please help !

Thanks for your work on this module.