I have reported this to the second-tier support. I will inform you as soon sI have an update
For now, please go to the WordPress Dashboard > Events, and instead of entering in the edit screen of the events use the + or pencil icon next to each event item in the list to do the translation.
I have an update from the second-tier support. You are using a new feature of The Events Calendar Pro plugin called Event series which we do not support yet.
1 more use case occurred last night.
I have a recursive event that starts in Oct 2023 and ends in May 2024 per day. 8 months-long recursive event approx 240 events.
When I try to translate using the "+" icon from the dashboard events page. it translated 240 events in the Spanish language instead of only recursive event.
I think WPML users need a solution for this ASAP. Please prioritize this issue in your development process.