Search Material Icons Filter on Filled and Outlined Not Filtering Some Icons

[DPH-MGB]

Steps to reproduce

1. When clicked Filled, expect to see just solid icons, but see a mix of filled and outlined
2. When click Outlined, expect to see just outlined icons, but see mix of filled and outlined
3. Missing: an option to see all icons

Looks like some icons are misclassified or classified as both filled and outlined.

Current behavior

No response

Expected behavior

No response

Context

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Your environment

npx @mui/envinfo

  Don't forget to mention which browser you used.
  Output from `npx @mui/envinfo` goes here.

Search keywords: Filled Outlined Search

[BuntyBru]

what i observed is that , the icons which are appearing in the "Outlined" option do have outlined attached in their name
For example

now when i choose "Outlined"
the ABC icon reappears but the name has changed

So there is a possibility that these icons visibly seem like the same thing , but do have variations ,
I tried rendering all the Abc icons
I was able to get this

As you can see different types of icons, which visibly look the same , but they have different names , and they are stored in different files too , so this is more of a visual problem.

For the 3rd point , it is definitely possible to add an "All" option, would like to pick that if possible