Upgraded to MW 1.43.0 LTS from 1.39.11. The DrawioEditor doesn't work on 1.43. I tried removing "callback": "mwsInitComponents", from the extensions.json file and this allowed the MediaWiki to load pages. However, this also prevented VisualEditor from working.
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Installing the BluespiceFoundation extension seems to have fixed the issue. Based on this, my issue may not be a defect with the DrawioEditor extension, but I'd propose listing BluespiceFoundation as a dependency for the DrawioEditor extension in its documentation.