Passenger capacity shows 0

Hi, my passenger seats have been configured however capacity shows 0 for routes in one direction but shows correct capacity for return routes.

According to: https://wordpress.org/support/topic/my-passenger-capacity-is-showing-as-zero/
A rollback on plugin version fixes this. However, not so in my case. Is there a specific version I should roll back to for the fix?
I’ve tried version 5.5.5 without success.
Other versions seem not to be compatible with the pro plugin version 5.2.9.

Is there a specific combination of the free and pro plugin versions to resolve the 0 seat issue?

Thanks.