Try switching the default before removing the others. If the others get added back, the default should start the same. If you just remove them, it might not update the default. (Because then it’s just showing you whatever is left over when it can’t find the default.)
Did you remove it or just switched the default to a different one?
I think it getting added again might happen in updates, if they change defaults that’s a whole other beast
Switching is enough for me and i didn’t had any weird behavior since years, beside the fullscreen VPN ad they did once
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Try switching the default before removing the others. If the others get added back, the default should start the same. If you just remove them, it might not update the default. (Because then it’s just showing you whatever is left over when it can’t find the default.)