on cut-here marks showing two blank lines when viewing the message

[Wayne Harris]

Having upgraded to GNU Emacs 27.1 from GNU Emacs 24, when wrap a region
of text with cut-here marks I now see two blank lines at the bottom of
the region when I visualize the message in the article window.  See an
image at this address:

  https://imgur.com/a/zeMeGip

It was not like that in GNU Emacs 24.  Is this really intended?  I wish
it would just show one blank line, just like it does at the top of the
region.  Is this a bug?

Here's the original text that you see in the image:

the signature:

--8<---------------[...]------------->8---
%helpeth parseTx 
0xf86c018504a817c8008252089479e4e5c6309eab8df0299973ef29ce2b001704a5880de0b6b3a7640000802ea042bf4dc13103df95cc5d8af2e4dd00932086c29578ecce67e8b16ec99af70fdfa0cefb6ea512f7d46b36f10a3b437e9652e4747627c9ed9b2048161524f9352663
/usr/local/lib/node_modules/helpeth/node_modules/ethereumjs-tx/index.js:198
      if (!this.verifySignature()) throw new Error('Invalid Signature')
                                   ^
Error: Invalid Signature
    at FakeTransaction.getSenderPublicKey 
(/usr/local/lib/node_modules/helpeth/node_modules/ethereumjs-tx/index.js:198:42)
    at FakeTransaction.getSenderAddress 
(/usr/local/lib/node_modules/helpeth/node_modules/ethereumjs-tx/index.js:187:25)
    at Object.<anonymous> (/usr/local/lib/node_modules/helpeth/helpeth:348:56)
    at Module._compile (node:internal/modules/cjs/loader:1108:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1137:10)
    at Module.load (node:internal/modules/cjs/loader:973:32)
    at Function.Module._load (node:internal/modules/cjs/loader:813:14)
    at Function.executeUserEntryPoint [as runMain] 
(node:internal/modules/run_main:76:12)
    at node:internal/main/run_main_module:17:47
--8<---------------[...]--------------->8---

If we inspect the RLP-encoding (Recursive Prefix Length, [...]