Steps to reproduce:

1. Create a new URP project.
2. Open Project Settings & Preferences windows, and check the Shader Graph page in both. Ensure Variant Limit setting in both is under 513, and do not close these windows.
3. Window > Package Manager > Shader Graph > Samples. Install Production Ready Shaders.
4. Open Assets > Samples > Shader Graph > 17.0.3 > Production Ready Shaders > Scenes > URPProductionReadyShaders
5. Note the "Are These Spheres Pink?" text, and the pink spheres.
6. Follow the steps on the text:

• Increase the Variant Limit to 513 in both Project Settings and Preferences.

Actual results: The spheres shouldn't be pink with the mentioned settings set to 513.  This persists after restarting the project and confirming that the variant limits are both at 513.

Expected results: The spheres are still pink.

Reproducible with versions: 6000.0.12f1 (17.0.3)

Can't test with versions:

• 6000.0.0b15 (17.0.3)

** Shader variant limit keeps resetting to 128 - no errors or warnings.
* Sample not available, even though the package version is the same as 12f1.
2023.3.0b10 (17.0.2), sample not available

• 2022.3.39f1 (14.0.11), couldn't get past UUM-75973
• 2021.3.41f1 (12.1.15), sample not available

Tested on (OS): MacOS Intel 12.7.4

Notes:
*
** Struggling to regression test as I keep running into UUM-75973 while trying to do this. Marking as not a regression for the time being. Please contact ticket reporter if further testing is needed.
* If you set the Variant Limit to 513 before importing Production Ready Shaders, there is no problem, and it works as expected.*
** Using Metal.
** Device specs:
* Processor:  2.5 GHz Quad-Core Intel Core i7
* Memory:  16 GB 1600 MHz DDR3
* Graphics: AMD Radeon R9 M370X 2 GB
Intel Iris Pro 1536 MB