If you notice that a site has Advanced Custom Fields wysiwyg toolbar buttons missing, it is likely because the ‘Basic’ toolbar is being displayed rather than the ‘Full’ toolbar. I was able to fix that issue and get them to show the Full toolbar by implementing the filter below.

This function removes the Basic toolbar from the array of available toolbars available to ACF wysiwyg fields, so the remaining Full toolbar is used instead. Here’s a before and after screenshot illustrating what it does:

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