Change of query_parameters is not recognized when done in onchange-function

[knallcharge]

I see a strange behaviour when trying to set the query_parameters of a Select2-form field. I have set query_parameters to ['var' => ''] in my form and it shows in the source-code of my page alright.
I now need to fill "var" with a value from another form-element dynamically, but the change is ignored and the value not sent to my remote_route. This strangely only happens when the change of the query_parameters are done in the onchange-event of the other field.

What works:

$('#my_element').data('query-parameters', {'var': 'value'});

Now I receive "value" in "var" in my remote_route and can process it.

What does NOT work:

$('#another_element').change(function () {
    $('#my_element').data('query-parameters', {'var': 'value'});
}

"var" is just empty in my remote_route in this case.

I have checked the contents of "var" using console.log($('#my_element').data('query-parameters')); before and after setting it and the change is done in both cases (!), only when setting it in the onchange-event, it is not transmitted to the remote_route.

[knallcharge]

I did some more research on this and found something: In select2entity.js the following line (146) seems to initialize the fields:
$('.select2entity[data-autostart="true"]').select2entity();
but that happens only once on document.ready, so my guess (I'm not good at JavaScript) is that once the page is loaded, the select2-fields are initialized, the query-parameters are taken from data-query-parameters, but that's it, the select2-fields won't get notified of any change in data-query-parameters, so the new value is never transmitted to the controller.

Just to test this, I changed my code and did this:

$('#another_element').change(function () {
    $('#my_element').data('query-parameters', {'var': 'value'});
    $('.select2entity[data-autostart="true"]').select2entity();
}

This wil basically re-initialize the select2-fields after "another_element" changes and have the select2-fields re-read the (now changed) value from "my_element".

I have no idea (once again: JavaScript ...) if this will break or overwrite anything in the select2-fields, but this actually resolves the problem and sends the (changed) values to the controller.

Don't know if this is a valid fix, so I'd appreciate if someone could verify this.
(I guess it would probably better, if the bundle read the current data-query-parameters before sending the request to the controller, making the re-initialization obsolete, but I have no idea how to do this.)