Steps to reproduce:

1. Create a new Unity project using a 3D Universal Template
2. Go to Edit > Preferences > Package Manager
3. Locate the Packages "Cache Location" field
4. Click on the folder button and select "Change Location"
5. Create a new folder in Local\Unity or Local\Unity\cache and select it
6. Observe the Console after installation is complete

Actual results: "TLS Allocator ALLOC_TEMP_TLS, underlying allocator ALLOC_TEMP_MAIN has unfreed allocations..." error and "Internal: Stack allocator ALLOC_TEMP_MAIN has unfreed allocations" warning

Expected results: No errors or warnings 

Reproducible with versions: 6000.0.0b11, 6000.0.65f1, 6000.2.15f1, 6000.3.3f1

Not reproducible with versions: 6000.4.0b4, 6000.5.0a4

Tested on (OS): Windows 11, macOS 26.1 (M1 Pro)

Notes:

• Initially, the issue reproduced instantly on both macOS and Windows, but after testing several versions, it can be quite inconsistent to reproduce at around ~ 1 in 5 times. Therefore, unsure if the affected versions are exactly correct. Could not find any duplicate tickets, suggesting it was fixed in later versions