Private tempstore storage contains data for previous anonymous user

I have an issue with private tempstore storage that I wasn’t able to solve. I’ve implemented a webform handler, which populates data in this storage and then I’m creating tokens out of the saved values. This works fine, however, when anonymous user comes to page where token value is used, he/she sees last value saved in to the storage, before his/her session has been created.

This is strange, because setting a value for anonymous user should create a session for user, if it doesn’t exist, yet: https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21TempStore%21PrivateTempStore.php/function/PrivateTempStore%3A%3Aset/8.6.x Do you have any idea why this happens, please? Should I use module https://www.drupal.org/project/session_based_temp_store? Should I consider using Sessions directly (https://drupal.stackexchange.com/a/246268/7580)?

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Private tempstore storage contains data for previous anonymous user

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