Localized file names required after clicking file name field

Hello!
We are running OJS 3.3.0.6 and have encountered an issue for multilingual journals where file names are required to be localized, but only after clicking the file name field. There was a similar issue for previous versions, but it was fixed from what I can understand: OJS3: uploading submission files in multilingual installations: does the file name have to be localized?

Before clicking the filename field (“Continue”-button clickable):
bild

After clicking the filename field:
bild

The only way to continue once the field has been clicked is to enter a filename in each active language.
Language settings for this journal are: UI, forms and submissions activated for Swedish, Danish, and English. Swedish is the primary language. However, we have noticed it in all journals with several active submission languages.

Any ideas? Could anyone running the same version check if it is a general issue, or if it might be local?