bug when exporting pdf using Latex/pandoc templet

[Hpeox]

• Searched existing issues to avoid creating duplicates.

• Confirmed that it can be reproduced in built-in themes without customized css.

• Searched http://support.typora.io/

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Describe the bug
when using the pdf (Latex/pandoc) template to export pdf file with pandoc extension pagebreak typora just can't deal with a paragraph with only strong words
An error about lua filter occurred: attempt to index a nil value (local 'command')
Somewhere says that typora just transfer a non-markdown file to pandoc, i think this is where the problem happens
To Reproduce
this is a minimal sample:

---
pagebreak:
 break-on:
   form-feed: false
   plaintext-command: false
---

test code

\newpage

test code

**test code**

use Typora open the file then export it with Latex/pandoc templet with an extra argument --lua-filter pagebreak.lua
then you will get the error in typora's log file or just the pop up window:

[RenderProcess 4][Error] Error running filter C:\Users\<user name>\AppData\Roaming\pandoc\filters\pagebreak.lua:
...sers\<user name>\AppData\Roaming\pandoc\filters\pagebreak.lua:81: attempt to index a nil value (local 'command')
stack traceback:
	...sers\<user name>\AppData\Roaming\pandoc\filters\pagebreak.lua:113: in function <...sers\<user name>\AppData\Roaming\pandoc\filters\pagebreak.lua:112>
	(...tail calls...)
	[C]: in function 'pandoc.List.find_if'
	...sers\<user name>\AppData\Roaming\pandoc\filters\pagebreak.lua:119: in upvalue 'is_pb'
	...sers\<user name>\AppData\Roaming\pandoc\filters\pagebreak.lua:122: in function <...sers\<user name>\AppData\Roaming\pandoc\filters\pagebreak.lua:121>
	[C]: in ?
	[C]: in method 'walk'
	...sers\<user name>\AppData\Roaming\pandoc\filters\pagebreak.lua:142: in function 'Pandoc'
stack traceback:
	...sers\<user name>\AppData\Roaming\pandoc\filters\pagebreak.lua:142: in function 'Pandoc'

then if remove the test code in the last line, typora can export the file correctly

also, if just convert the file in cmd with command pandoc test.md -o test.pdf --lua-filter pagebreak.lua or use a custom template in typora, the file can be exported successfully, So i think it's typora's bug

Something else:
if remove the line plaintext-command: false, no error occurs regardless of whether form-feed is true or false, but \newpage is not processed correctly at the same time
also, if remove the whole metadata block, \newpage will remain in pdf

Expected behavior
I just need to insert some pagebreak in my pdf file, however the html label doesn't work when exporting to pdf with pandoc

Desktop:

• OS: Win11

Typora Version

• 1.9.5

Pandoc Version

• 3.6