>> So I suggest doing one of the following:
>>
>> - implement the feature differently, without this side-effect; or

From the second image above, I'd say that the feature isn't working
correctly.

> Correction: I forgot that there's already a way to opt-out, by setting
> help-enable-completion-autoload to nil.

This is what I see after setting `help-enable-completion-autoload' to
nil: