Reproduction steps:
1. Open the attached “IN-103666.zip” project
2. Open the “SampleScene”
3. From the Hierarchy, select the “Text (TMP)” GameObject (Canvas > Image > Text (TMP))
4. Observe its Height in the Inspector
5. From the Hierarchy, open the “Image” prefab by clicking on the arrow on its right
6. Select “Text (TMP)” and in the Inspector change its Height to “888”
7. Exit the prefab editing by clicking the arrow in the Hierarchy
8. Observe the “Text (TMP)” Height in the Inspector

Expected result: Height value is “888”
Actual result: Height value is “88” or “8”

Reproducible with: 2023.3.0b7, 2022.3.63f1, 6000.0.50f1, 6000.1.6f1, 6000.2.0b4
Not reproducible with: 2023.3.0b6

Reproducible on: Windows 11
Not reproducible on: No other environment tested

Notes:
- Generally, the bug happens right after prefab creation or opening the scene. Then it is reproducible 100%. But in some cases, it fixes itself once, and from there, you cannot reproduce it anymore. In this case, just delete the Image instance and prefab and recreate one, or create any new scene and then reopen the “SampleScene”
- Reproduces with other UI elements as well