CPQ Salesforce Integration - cached object error

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We recently switched our CPQ instances from old to new ones. So while integrating salesforce with new CPQ instances, we modified connected App URLs and CPQ cloud site settings in salesforce by changing references from old instances to new ones, and followed all other steps of Integration.

When I create a new quote , I get the landing page. But if I try to change anything on quote which refreshes, I get the "An error occurred on cached object. Please refresh quote and edit again" error. And if I click on save, I get session time out error and quote is not saved. This is only happening on new quotes. For old quotes, I am able to edit, save quote, integrate properly with salesforce without any issues.