Fighting the “Undefined array key instance in ArgumentsResolver.php” problem

While upgrading one of our merchant’s production instances, I run into a problem during setup:di:compile. The process failed with the error “Undefined array key instance in ArgumentsResolver.php”. I outlined the steps I took to debug and fix the issue in my latest blog post: https://blog.bitexpert.de/blog/magento_undefined_key_arguments_resolver

submitted by /u/shochdoerfer
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