Since #2901158: Changes are lost when collapsing a paragraphs subform including an inline_entity_form → was committed, we can remove our custom solution.
Postponed
6.3
Code
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Issue #2901158: Changes are lost when collapsing a paragraphs subform including an inline_entity_form → was reverted due to regression. Continuing work in 🐛 Changes are lost when collapsing a paragraphs subform including an inline_entity_form Needs work