I am not sure that you have provided enough information for solving this issue, it is unclear why and when your menu disappears and under what conditions.
I am not sure why you are registering all the menus, when you probably need one.
I can only advise you to use a plugin that manages languages on the site, there are many options that will probably make this a bit easier for you.
If you provide more information or a test url, I will be happy to take another look
Good luck,
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