hi Krailit,
We have logged this reported issue “hasChildRecords data property is not updated properly" as bug. We are working on a fix for this issue and plan to include it in our 2023 Volume 3 main release, which is currently scheduled for Sep, 09 2024.
You can track the progress of the resolution by visiting the feedback link provided below:
Feedback link: https://www.syncfusion.com/feedback/60489/haschildrecords-property-value-is-not-updated-properly
Disclaimer: Inclusion of this solution in the weekly release may change due to other factors including but not limited to QA checks and works reprioritization.