Fix phpstan/phpstan#13539: property.notFound in chained isset() with checkDynamicProperties#5562

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predictor2718:fix-13539

Commits on Apr 28, 2026

Fix phpstan/phpstan#13539: property.notFound in chained isset() with checkDynamicProperties
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Update testBug13529 to expect no errors after fix for #13539
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Fix bug-13539 test for PHP 7.4 compatibility (use PHPDoc instead of native mixed)
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