Follow-up Comment #1, bug #67757 (group groff): In my initial comment, I led with (a lot of) background, which may have been bewildering to the people I CCed on this ticket, who last contributed to the relevant code 10 years ago.
Here's the TL;DR: would it be incorrect to apply the following patch?
diff --git a/tmac/ja.tmac b/tmac/ja.tmac
index fda1174af..476d31791 100644
--- a/tmac/ja.tmac
+++ b/tmac/ja.tmac
@@ -45,7 +45,7 @@
\[u3041]-\[u3096] \[u30A0]-\[u30FF] \[u4E00]-\[u9FFF]
.
.cflags 128 \C'[CJKprepunct]'
-.cflags 266 \C'[CJKpostpunct]'
+.cflags 256 \C'[CJKpostpunct]'
.cflags 512 \C'[CJKnormal]'
.
.\" Japanese hyphenation (disabled)
diff --git a/tmac/zh.tmac b/tmac/zh.tmac
index 26939bd41..585b58bae 100644
--- a/tmac/zh.tmac
+++ b/tmac/zh.tmac
@@ -44,7 +44,7 @@
\[u4E00]-\[u9FFF]
.
.cflags 128 \C'[CJKprepunct]'
-.cflags 266 \C'[CJKpostpunct]'
+.cflags 256 \C'[CJKpostpunct]'
.cflags 512 \C'[CJKnormal]'
.
.\" Chinese hyphenation (disabled)
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