Bug? iframe stripping from GC event description on auto im

I’m doing some testing pre-purchase for a new site for my cycling club and have hit a problem. In the description of the events in Google Calendar is an iframe with an embed of the route for a ride from Ride With GPS some other text – code:

<iframe src="//ridewithgps.com/routes/9995049/embed" height="600" width="100%" frameborder="0" style="border-bottom:1px solid #a0a0a0;"></iframe>

<a href="https://www.allkins.co.uk/bmccroutes/LR042G-Great_Rollright_Garden_Centre.tcx" target="_blank">Direct Navigation Download</a>
(Right click and Save file, then copy to your Garmin/GPS device)

When I manually import the events (by clicking the ‘Refresh’ button) the iframe is displayed in the agenda view when expanded and on the detail page – see link below for screengrab.

Screengrab: https://www.bmcc2000.co.uk/image/iframe_inplace.png

However, when the events are automatically imported via the feed setting (hourly) the iframe doesn’t appear in the event at all – it seems to get stripped out – see screengrab:

Screengrab: https://www.bmcc2000.co.uk/image/iframe_stripped.png

Site home page is: https://www.bmcc2000.co.uk and you can see the agenda view on there.

Thanks for looking.

Dominic

https://www.ads-software.com/plugins/all-in-one-event-calendar/