More often than not, composer is not finding the correct files to include after the site has been deployed via GH Actions to a WP-Engine server. Investigate if this issue is specific to their platform or all hosts. Update the deployment scripts if required.
This happened because src was in the ignore file, and a nested src folder was in the composer vendor directory. Fixed in: e761f4379748f28bfcb01291c4eee76adacd01bc
More often than not, composer is not finding the correct files to include after the site has been deployed via GH Actions to a WP-Engine server. Investigate if this issue is specific to their platform or all hosts. Update the deployment scripts if required.