Layout shift caused by product thumbnail

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Dear all,

I'm trying to prepare my shopify store for May 2021 and the "core web vitals" Google update.

When I analyse my product pages with the PageSpeedInsights tool, I have a quite high layout shift (>0.22). When I check into details, I see that the product thumbnail slider is causing this layout shift, as you can see on the screenshot below:



I have tried to edit the code and allocate some fixed space to this thumbnail slider with html "height" and "width" attributes, but I failed. Even though I don't see a layout shift anymore when I refresh the page, the PageSpeedInsights tool still shows the same issue.

Has anyone any idea to resolve this issue?

Thank you for your help