Large RAM usage increase when loading some legacy scenes in 2025.2

Steps to reproduce:

1. Open TM 2025.1
2. Open the Salt Flats
3.  Note down the RAM usage
4. Save the scene
5. Open the same scene with the beta 3
6. Note down the RAM usage. 
7. Compare results

Expected results:

The RAM Usage should be within 15% of each other 

Actual results:

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