Running WP-Sweep disables flags in Polylang

We have met the following problem:

When I run sweep, the language-flag of the not-default languages has disappeared and I choosing All Pages in the menu, only the pages of one language is visible. The pages of other languages are still present, but only indirectly accessible by the pencil below the language (represented by letters, not by the flag). In deleting and re-inserting the languages and assigning again the languages to the pages, all is restored. But in running sweep, the problem re-appears.

It was also reported to WP-Sweep.

Would it be possible for you to fix it from Polylang’s side?

Many thanks

PW