Hello @MS Techie
Thank you for reaching out. I would like to confirm that this would only happen if you enable Group Writeback feature within Azure AD Connect Sync.
Group writeback allows you to write cloud groups back to your on-premises Active Directory instance by using Azure Active Directory (Azure AD) Connect sync. You can use this feature to manage groups in the cloud, while controlling access to on-premises applications and resources.
There are two versions of group writeback. The original version is in general availability and is limited to writing back Microsoft 365 groups to your on-premises Active Directory instance as distribution groups. The new, expanded version of group writeback is in public preview and you can write back Microsoft 365 groups as distribution groups, security groups, or mail-enabled security groups.
For more details, please review following screenshot and documentation link: Plan for Azure AD Connect group writeback
I hope this helps to resolve your query. Please "Accept the answer" if the information helped you. This will help us and others in the community as well.