Module's behaviour has changed with multiple values taxonomy term field

Problem/Motivation

Hi everybody

First, I met the same issues as many and the module was totally broken ;
https://www.drupal.org/project/field_states_ui/issues/3380481 🐛 It is no longer possible to add multiple field states Needs review
https://www.drupal.org/project/field_states_ui/issues/3371927 🐛 PluginNotFoundException: The "" plugin does not exist Needs review

After fix that with the patch provided, I still have a strange behaviour:
I display a field conditionally (visible state) if a taxonomy term (which accept multiple values) has the value=12 (term ID)

I already did that and have another coupled fields in another bundle in the same site.
Previously the conditional field is visible if the taxonomy term field has the specified value among others.

Now, the conditional field is only visible when the taxonomy term field has the unique value indicated checked. If I check one more value, the conditional field disappear (not what I want).

What is original now is that I have 2 fields configured identically on the same site but which do not behave in the same way. One created years ago and the other now. I wonder what update could have changed that...?