Criteria:
- FOSS.
- Works on secureblue.
- Has a verified flatpak.
You need to be more specific, an IDE for what exactly?
VSCodium is an option you could consider but it’s pretty basic, it could be fine depending on your usecase though.
KDevelop is more of an IDE than a code editor like VSCodium so that could be worth a look too.
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JetBrains IDEs are open source I think GitHub - JetBrains/intellij-community: IntelliJ IDEA Community Edition & IntelliJ Platform
Eclipse IDE:
1- is FOSS.
2- It should work on any environment because it has official standalone version.
3- It does not have official Flatpak version. But as a developer I never able to use Flatpak or snap version of any my development tools. Because a IDE or framework they depend themself in different ways… If you research on internet little bit, you will see that many developers also face same problem with Flatpak or Snap. You can find many issues/topics/articles about this. I don’t recommend to use Flatpak or snap on development apps.
I always prefer official portable version of development tools/apps/frameworks…
Vscodium
VSCodium is another alternative.
Eclipse Theia
Also we have Eclipse Theia alternative of VSCode develop by Eclipse Foundation. I think we should consider it to suggest on PG 
Intellij
I don’t trust intellij. Most of good features are in PRO version. they have a validation module of local computer (to validate if you are using key/license correctly), they are great to fingerprint your machine.
Zed written in rust native works well on linux developed by the original devloper of atom ide
Cool, but OP wants a verified one, Zed is Unverified.
Yes i know because they don’t support flathub officially they provide as a flatpak but it is a bug report that they consider this to be verified after they start supporting flathub flatpak officially.
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Hey, have you ever tried Cursor, a VSCode fork?