Instead of manipulating the SSR HTML in PHP, we might be able to add the necessary information to the wrapper element (which we need anyways, for mounting – see T296202#7652549 and the next comment there), and then use some CSS like .wikibase-entitytermsview-noneditable .wikibase-sectionedit { display: none; } to hide the sectionedit component when the wrapper element indicates the page is non-editable.

Task Review Notes:

• In T318137 as part of the Gerrit patch, hydration was completely disabled, and the DOM is created from scratch in the client-side, which renders the problem presented in this task irrepreducible.
• The question remains whether we want to re-enable hydration, and as a result we will need to solve this issue too.

Prioritization Notes:

• Does not affect end - users / production
• Does affect development efforts (ideally we do not suppress warning and errors, but solve them)
• Unclear whether affect onboarding efforts (checks and tests are a pivotal part of trying to understand a system, ideally they should pass, but the task might be outdated)
• Does not affect additional stakeholders.

I think MediaWiki-extensions-Wikibase-Client was added by mistake. If it was added intentionally, then feel free to readd it.