Fix a mismatched new/delete ASAN error #2157

Job	Run time
Linux GCC 9 Debug (C++17)	3m 24s
Linux GCC 9 Optimised (C++17)	4m 21s
Linux GCC 9 Debug (C++20)	3m 18s
Linux GCC 9 Optimised (C++20)	3m 56s
Linux GCC 10 Debug (C++17)	3m 32s
Linux GCC 10 Optimised (C++17)	3m 29s
Linux GCC 10 Debug (C++20)	5m 9s
Linux GCC 10 Optimised (C++20)	4m 12s
Linux GCC 10 Debug (C++20) w/coroutines	4m 29s
Linux GCC 10 Optimised (C++20) w/coroutines	5m 34s
Linux Clang 10 Debug (C++17)	3m 17s
Linux Clang 10 Optimised (C++17)	4m 1s
Linux Clang 10 Debug (C++20)	4m 35s
Linux Clang 10 Optimised (C++20)	4m 46s
Linux Clang 11 Debug (C++17)	3m 13s
Linux Clang 11 Optimised (C++17)	5m 9s
Linux Clang 11 Debug (C++20)	3m 18s
Linux Clang 11 Optimised (C++20)	5m 33s
Linux Clang 12 Debug (C++17)	3m 36s
Linux Clang 12 Optimised (C++17)	5m 25s
Linux Clang 12 Debug (C++20)	3m 48s
Linux Clang 12 Optimised (C++20)	4m 18s
macOS GCC Debug (C++17)	2m 25s
macOS GCC Optimised (C++17)	3m 10s
macOS GCC Debug (C++20)	3m 44s
macOS GCC Optimised (C++20)	3m 13s
macOS Clang Debug (C++17)	2m 50s
macOS Clang Optimised (C++17)	5m 39s
macOS Clang Debug (C++20)	3m 18s
macOS Clang Optimised (C++20)	3m 46s
Windows MSVC 2019 Debug (C++17)	53s
Windows MSVC 2019 Optimised (C++17)	1m 4s
Windows MSVC 2019 Debug (C++20)	4m 14s
Windows MSVC 2019 Optimised (C++20)	6m 27s
	2h 13m 6s

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