`markdown-mode-fill-paragraph` mangles inline attributes by treating them as text

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This is a problem because hello {.hello} is just the text hello {.hello} but

hello
{.hello}

renders as a paragraph with a hello class attribute.

Expected Behavior

this is a run-on sentence that takes more than 80 characters to conclude, and is therefore wrapped
{.hello}

↓

this is a run-on sentence that takes more than 80 characters to conclude, and
is therefore wrapped
{.hello}

Actual Behavior

this is a run-on sentence that takes more than 80 characters to conclude, and
is therefore wrapped {.hello}

Software Versions

• Markdown Mode: markdown-mode, version 2.7-alpha
• Emacs: GNU Emacs 29.4 (build 1, aarch64-apple-darwin24.0.0, NS appkit-2566.00 Version 15.0.1 (Build 24A348)) of 2024-10-07
• OS:

  ProductName:		macOS
  ProductVersion:		15.1.1
  BuildVersion:		24B91