After upgraded from 2.3.5-p2 to 2.4, I have a very strange behaviour.
Normally the color swatch can be click and select freely.
But my case is when click an color, the colour locked and unable to select other color until click it again. It happens on all products and I take this as example. https://ibb.co/44fvKPZ
I select a color (blue in screenshot) https://ibb.co/MPKPn0h, it will make other unselectable until I click blue colour color again to unlock blue color selection.
Thanks in advance.
Magento 2.4 still not stable version, most of the functionality not working, better to keep using Magento 2.3.
thanks for reply.
I found it was caused by Amasty Color Swatch Pro. Once installed, it caused the problem.