Vegas 20.0 B326
OS: Windows 10 Pro, Version 10.0.19044 Build 19044
HW: i7-10700

Expectation: 'Paste Event Attributes' including a 'Color Gradient' updates the parameter immediately.

Observation:
a) Parameter are not updated for the pasted event.
b) They are not updated if 'Undo Paste Event' was executed,too.

How to reproduce:
x) Select an event and press <Alt>+<G> to open 'Color Gradient'.
x) Change a parameter e.g. in tab 'Color Wheels' / 'Lift' the 'Y'-control = 1
x) Press <Copy> for this changed event.
x) Select another event and press <Paste Event Attributes>
→ (OK) the effect is shown as result in the preview window
=> (NOK) but the 'Y'-control of 'Color Gradient' for the new event still shows 0.
Only if toggling between previous and this new event the new value is shown.

x) Select the previous event where the attributes are copied from
x) Select the new changed event again
→ now the 'Y'-control = 1
x) Press <Undo> in the selected new event
=> (NOK) the 'Y'-control still shows 1 (OK: the effect is not shown on the previous window anymore)