[core] Fix PR #32830 for fixed extensionless output template #2973

Job	Run time
Linter	14s
Select tests from inputs	1s
Run tests (ubuntu-20.04, 2.7, cpython, core, sh)	1m 0s
Run tests (ubuntu-20.04, 3.2, cpython, core, sh)	1m 10s
Run tests (ubuntu-20.04, 3.5, cpython, core, sh)	1m 9s
Run tests (ubuntu-20.04, 3.9, cpython, core, sh)	1m 8s
Run tests (ubuntu-20.04, 3.11, cpython, core, sh)	1m 8s
Run tests (ubuntu-20.04, pypy-2.7, cpython, core, sh)	2m 18s
Run tests (ubuntu-20.04, pypy-3.6, cpython, core, sh)	2m 25s
Run tests (ubuntu-20.04, pypy-3.7, cpython, core, sh)	2m 36s
Run tests (windows-2019, 3.4, cpython, core, bat)	2m 4s
Run tests (windows-2019, 3.4, cpython, nodownload, bat)	1m 2s
Run tests (ubuntu-20.04, 2.7, jython, core, sh)	3m 0s
Run tests (ubuntu-20.04, 2.7, jython, nodownload, sh)	23s
	19m 38s

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