Reproduction steps:
1. Open the attached project “SaveProperty”
2. Open Project Settings (Edit > Project Settings)
3. In the Project Settings window open Editor settings and make sure that “Use IMGUI Default Inspector” is disabled
4. In the Project window select “Assets/GameObject.prefab”
5. In the Inspector window, under “New Behaviour Script” change the value of property “X” by dragging
6. Observe the loading circle on the mouse pointer

Expected result: The loading circle appears only when the slider is released
Actual result: The loading circle appears periodically while dragging

Reproducible with: 2022.3.0f1, 2023.1.0b16, 2023.2.0a16
Couldn't test with: 2021.3.25f1 (IMGUI is enabled by default)

Reproducible on: Windows 10

Notes:
Enabling “Use IMGUI Default Inspector” (Edit > Project Settings > Editor) makes the loading circle appear only when the slider is released
Comparing IMGUI and UITK with the Profiler (Window > Analysis > Profiler) shows, that UITK does a similar process periodically that IMGUI does when the slider is released.