We have a specific code in core components for articles:

<?php // Creating 'id' hiddenField to cope with com_associations sidebyside loop ?>
		<?php if ($params->get('show_publishing_options', 1) == 0) : ?>
			<?php $hidden_fields = $this->form->getInput('id'); ?>
			<div class="hidden"><?php echo $hidden_fields; ?></div>
		<?php endif; ?>

This is only due to the specific articles parameter show_publishing_options.
I do not think we use that for other core components.

@infograf768 I do not think we use that for other core components.

Thank you very much for looking.

It is the same with com_contact:

I want to put it differently
If you install the my com_foo component https://github.com/astridx/boilerplate/releases/tag/v1.0.0 and you do not use the layout, I mean, you delete this line:
https://github.com/astridx/boilerplate/blob/8068f3e4349207f759a567d1e2331c592142fb6c/src/administrator/components/com_foos/tmpl/foo/edit.php#L77

Then you run int this issue.

I encountered this problem when I prepared this component for use in Joomla version 4 (from Joomla version 3).

Am I missing something or is it likely that others will encounter this problem and we could avoid it?

You just need to render the ID field, not necessarily using joomla.edit.publishingdata layout. If your fields are using different names, that's another issue. The selectors in the script would have to be configurable.

@SharkyKZ The selectors in the script would have to be configurable.

What do you mean exactly?
Can I configure the selectors (I don't see that) or should the script be changed so that the selectors could be configured?
Do you think this is an issue and I should leave this open here.

The script could be changed to support this, if needed.

@astridx
What I meant is that com_content needs to define this id hidden field, but not com_contact for example.
To test, I commented <?php //echo LayoutHelper::render('joomla.edit.publishingdata', $this); ?> in contact edit and I had no loop issue in multilingual component.

@infograf768 I have this issue in all components.
But as I am not sure if this is a bug I close this issue. I put a link to this issue on the end of the doc page https://docs.joomla.org/J3.x:Multilingual_Associations/Developers