Fixed state event ending on the last Sunday in March (BST) returns multiple events

Hello

When adding a fixed state event that ends on the last Sunday in March (start of British Summertime), the even being returned to FullCalendar Scheduler is split into several events and displaying as such when managing the unit.

I have a fixed state event calendar (availability) set to year view with 12 hour slot duration so that I can accommodate half day change overs. All events start and end at midday.

To recreate the issue add an event that finishes on the morning of the last Sunday in March (this year the 26th). The result is an event that is displayed with a gap as if it is two separate events.

When retrieving the event to display availability or calculate booking prices several events are returned rather than the one that I expect. If I have one booking for the unit I would expect to see three events returned (available period prior to booking, booked period and available period after booking). Instead I get five events.

I have attached screen shots that illustrate the issue. I have filed this as a support request as I am not sure if this is expected behaviour or not. Would someone be able to advise me if this is to be expected or a bug?

I am using Drupal 7.54 with BAT module version 7.x-1.17 with what I believe to be the latest BAT library.

Thank you.