phpstan does not recognize keys after array literal merge correctly

phpstan does not recognize keys after array literal merge correctly

Bug report

phpstan should not report an error, since the keys are preserved and the needed key definitly exists due to MinimalRowDefinition

Code snippet that reproduces the problem

https://phpstan.org/r/1a11403d-e08d-4194-a516-7ead122e35d3

Expected output

phpstan should not report an error

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