Remove optional chaining in assert() call to workaround bug #3676

Job	Run time
Install	23s
Publish Docs to Cloudflare Pages	1m 32s
Floating Deps Test	1m 11s
Lint	51s
Default Tests	1m 12s
typescript@4.8	1m 1s
typescript@4.9	44s
typescript@5.0	46s
typescript@5.1	45s
ember-lts-4.4	1m 11s
ember-lts-4.8	1m 14s
ember-release	1m 5s
ember-beta	1m 26s
ember-canary	1m 8s
'ember-lts-4.8 + embroider-safe'	1m 17s
'ember-lts-4.8 + embroider-optimized'	1m 1s
'ember-release + embroider-optimized'	1m 1s
Release	0s
	17m 48s

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