How to reproduce:
1. Open the attached project
2. Select the two "Array" objects in the "SampleScene"
3. Observe that the array values are non-equal for the two objects and thus show the "-' symbol
4. Either double click the value - type in a new one or slightly drag over the existing "-" value and then type in a new one
5. Observe the value that actually shows up

Expected result: If you double click on a value to select it and then type in "5" for example then 5 should be the new value
Actual result: If you double click on a value to select it and then type in "5" the value ends up as "<5>" which resets it to 0. A similar thing happens when you drag your mouse slightly over the value's text - it ends up as "<mul5>", "<m5>", etc.

Reproduced in: 2020.2.0a15, 2020.1.0b14, 2019.4.2f1, 2018.4.23f1, 2017.4.40f1