Simple Animation is done only in last duration seconds...

Well, the title is a bit off, but it's basically that...

I'm using the standard animation lib to achieve a simple curtain effect on a Panel... I initialise the scale animation, set its duration and start it assigning the panel as target view...
The animation sort of works... But only in the last moments of the duration...
If duration is 1000 (1s), it happens almost instantly in the last milliseconds of the duration, if I set duration to 15000 (15s), the actual animation takes place only in...

Simple Animation is done only in last duration seconds...

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