The PDF Commenting feature is not available in ESR v140.4.0, so the crash reported cannot be reproduced in this version. I assume the fix was pushed to this version if ever the feature was uplifted to ESR 140.4.
Bug 1990785 Comment 26 Edit History
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The PDF Commenting feature is not available in ESR v140.4.0, so the crash reported cannot be reproduced in this version. I assume the fix was pushed to this version if ever the feature was uplifted to ESR 140.4. I will change the status of the issue to 'Verified Fixed'.