Thanks， Hans.

My module works again now, with the help of tex.preparelinebreak().

For potential readers:
tex.preparelinebreak(list) modifyed my list for tex.linebreak(list) to:

<par vmodepar> # by user in advance, necessary
<glue parinitleftskip>
<glue parinitrightskip>
<glue indentskip> # by user in advance, necessary
...
<penalty linepenalty> # The last glue here, in the end of the list, is removed
<glue parfillleftskip>
<glue parfillskip> # as same as parfillrightskip

黄复雄 <aahuaang@gmail.com> 于2022年7月16日周六 10:02写道：

Thanks, Hans

I modified my list to:

<node : nil <= 2371 => 2873 : par vmodepar>
<node : 2371 <= 2873 => 3113 : glue indentskip>
<node : 2873 <= 3113 => 3119 : glue parinitleftskip>
<node : 3113 <= 3119 => 2879 : glue parinitrightskip>
<node : 3119 <= 2879 => 2891 : glyph unset>
...
<node : 636 <= 3077 => 639 : glyph unset>
<node : 3077 <= 639 => 3089 : kern userkern>
<node : 639 <= 3089 => 2334 : glue userskip>
<node : 3089 <= 2334 => 3095 : rule normal>
<node : 2334 <= 3095 => 3101 : glue spaceskip>
<node : 3095 <= 3101 => 642 : glue spaceskip>
<node : 3101 <= 642 => 3107 : penalty userpenalty>
<node : 642 <= 3107 => 645 : glue userskip>
<node : 3107 <= 645 => 3125 : penalty userpenalty>
<node : 645 <= 3125 => 3131 : glue parfillleftskip>
<node : 3125 <= 3131 => nil : glue parfillskip>

but the error is the same, so I'll wait the tex.preparelinebreak(), and observe it's work for more details.

Huang Fusyong(黄复雄)