Issue
Unable to publish or run workflows with Task-based actions (Assign Flexi task, Assign to-do task, Request approval, Request data, Request review) after installing the July 2025 CU for SharePoint 2013, 2016, 2019.

Resolution
Extract a set of merged ULS logs from within 5 minutes of the workflow failing, using the following Powershell script:
 

Merge-SPLogFile -Path "<replace with filepath\filename.log>" -Overwrite -StartTime "<mm/dd/yyyy hh:mm>" -EndTime "<mm/dd/yyyy hh:mm">

If the error message “Feature has been temporarily disabled" is present, then apply the following solution first:

https://community.nintex.com/nintex-for-sharepoint-67/unable-to-publish-or-run-workflows-after-installing-september-2024-cu-72500

Thereafter apply the following:

https://community.nintex.com/nintex-for-sharepoint-67/workflows-with-a-pause-action-fail-to-run-or-do-not-progress-after-applying-december-2022-sharepoint-cumulative-update-31735

Should you still experience the same error, run the following powercmdlet to disable the SharePoint security feature:

$farm=Get-SPFarm

$farm.EnablePreParseSecurityCheckForWorkflow ## Output was true.

$farm.EnablePreParseSecurityCheckForWorkflow = $false

$farm.update()

This will enable workflows to start working. Once done, please create a new support case via our customer portal (https://customer.nintex.com) that includes the merged ULS logs for further review by one of our engineers.

Source
https://support.microsoft.com/en-us/topic/some-scenarios-of-sharepoint-2010-workflow-are-affected-after-applying-the-july-security-update-for-sharepoint-server-kb5004862-be361cd6-9f54-48c4-b890-2c4b7cf49d13