This bug is seen by more users with the fix for bug 1846224. For example, if a JA user with ETP set to Strict sets font.name.sans-serif.ja to "BIZ UDPゴシック" through about:preferences, which is the local font name for the "BIZ UDPGothic" font, "BIZ UDPゴシック" will not match and will use Meiryo font which is set to font.name-list.sans-serif.en for fallback.
Bug 1850672 Comment 2 Edit History
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This bug is seen by more users with the fix for bug 1846224. For example, if a JA user with ETP set to Strict sets font.name.sans-serif.ja to "BIZ UDPゴシック" through about:preferences, which is the localized font name for the "BIZ UDPGothic" font, "BIZ UDPゴシック" will not match and will use Meiryo font which is set to font.name-list.sans-serif.en for fallback.