Umap - CSV Import failed with added <br data-mce-bogus="1">

Hej,
I have created several maps with CSV Import for our non-profit organisation of bee-keepers and this worked fine since a few weeks ago.

see here : Karte der Züchter im Landesverband Hessen – Landesverband Hessischer Imker e.V.
CSV-Data: **https://technik.hessische-imker.de/umap/zuechter.csv
**
Last week, I noticed that the import of the CSV-Data failed because of an added

...csv"<br data-mce-bogus="1">

The URLs are fine as I can download the CSV-Files using the browser (FF, Chrome, EDGE)

I see that some other maps seem to have the same issue:

Is there anything changed ?
Doing something wrong ??

Thanks for your support.