Markdown spoiler/details working in preview, but not in userscript info.

I edited out the ads in the screenshots, to accentuate the changes the userscript makes, but markdown code doesn't work inside spoilers.

Spoiler:

ReadM Homepage After ![ReadM Homepage After](https://i.imgur.com/VZRxpcw.jpg "ReadM Homepage After")

Without spoiler:
ReadM Homepage After

Oh, and the code:

Spoiler:
<details><summary>ReadM Manga Before</summary>
![ReadM Manga Before](https://i.imgur.com/5t198F5.png "ReadM Manga Before")
</details>

Without spoiler:
![ReadM Manga Before](https://i.imgur.com/5t198F5.png "ReadM Manga Before")