Strapi v4 M-to-M Creates Two Join Table?

migration guides? sorry I am not migrate from any previous version
I use Strapi just from this January and it’s already v4.5.3

Anw if you courious how to reproduce it, I make the relation via admin UI like this

Just try it, create brand new strapi app, create two content type, then make the m-to-m relations
I believe you will get same result: two join table