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In my case, replacing the ps_mbo module and cleared the cache solved the issue you mentioned at the beginning of the topic (with tablangs...):

https://github.com/PrestaShopCorp/ps_mbo/releases/tag/v2.0.1

In my case, this solved this issue you mentioned at the beginning of the topic (with tablangs...):

https://github.com/PrestaShopCorp/ps_mbo/releases/tag/v2.0.1