Import status code 400

Hi, I am using version 3.109.0 and I am encountering an issue during the import phase. Here is the error message:

Request failed with status code 400

Chrome Console: Failed to load resource: the server responded with a status of 400 () app.min.js?ver=3.109.0:2 MetaSlider (import-error): AxiosError: Request failed with status code 400 at Oc (app.min.js?ver=3.109.0:2:347792) at XMLHttpRequest.g (app.min.js?ver=3.109.0:2:352743)

I have tested this both on the same WordPress instance where the export was generated and on a different one. The slider is very simple, containing only a single image.

Best regards, Alex