Data Merge stopped supporting foreign characters in column names

Hi, I’ve updated my InDesign to version 21.5.1 yesterday and noticed, that in Data Merge, it stopped supporting danish letters in the .csv’s column names. It changes the letters to a random character, so the data merge function doesn’t work anymore because it can’t figure out the link between the .csv and the placeholders.
My job relies heavily on data merge so I rolled the update back to 21.4.1 and it works perfectly. I hope the bug will soon be resolved.