Fix: Can't save 2 entities consecutively (React + manytomany)

[qmonmert]

Fix #13182

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[pascalgrimaud]

can you rewrite your commit text with more explicite ones plz ?

[ctamisier]

It's a detail but I think it's better to have only one commit.
For me the test is bound to the fix. If you checkout this commit (the fix), I would like to have the test as well.

[qmonmert]

@pascalgrimaud done (rewrite commit)
@ctamisier done (just one commit)

[ruddell]

Tested and it fixes the issue, thanks @qmonmert