How to reproduce:
1. Open the ‘SendMessageTest.zip' project
2. Build the project with WebGL
3. In Build 'Inspect Element → Console’
4. Observe the result

Expected result: Received number value is the same as the sent one
Actual result: Received number value is not the same as the sent one

Reproducible with: 6000.0.58f2, 6000.2.6f2, 6000.3.0b4, 6000.4.0a1
Could not test with: 2023.1.0a1 (Not able to install the WebGL module)

Reproducible on: macOS 26.0 (M1 Max)
Not reproducible on: No other environments tested

Note:
Values Sent/Received:
1485000000 | 1484999936
1485602900 | 1485602944
1485602930 | 1485602944