Hi Thomas!
Just wanted to share with you that we have shipped a fix for this issue. It’s all on our Event Aggregator server side of things so you don’t need to update any plugins.
As always, please make sure you are using the latest versions of our plugins. Remember you can always download our plugins from your downloads page > https://theeventscalendar.com/my-account/downloads/
We appreciate your patience while we worked on this.
Please try your imports again and let us know if the fix works for your site.
Best,
Victor