Light Dom slots don't trigger disconnectedCallback in synthetic lifecycle

[jmsjtu]

Description

Now that light DOM slots use fragments (#3649), they don't trigger disconnectedCallback when ENABLE_NATIVE_CUSTOM_ELEMENT_LIFECYCLE is not set.

Steps to Reproduce

Repro:

https://stackblitz.com/edit/salesforce-lwc-fcxo47?file=src%2Fmain.js

In the above example, the disconnectedCallback should be invoked when swapping between the if conditions.

[nolanlawson]

Does this affect scoped slots as well? And lwc:if/elseif/else? Those all use VFragments as well.

[jmsjtu]

Does this affect scoped slots as well? And lwc:if/elseif/else? Those all use VFragments as well.

@nolanlawson I did some more investigation related to this question and posted a new issue #3827

Working on updating #3824 to bring the light DOM slot behavior back to parity with LWC 3.x.x and opened #3827 to investigate the new bug that's been discovered.

Should have something ready in the morning!

[git2gus]

This issue has been linked to a new work item: W-14361259