Add-PnPMicrosoft365GroupOwner : Adding user and changing role manually shows weird behavior

[KarishmaSahuji]

Hi Team,
I am using Add-PnPMicrosoft365GroupOwner command to add owners in my site .
But, after adding owners , if I manually go to my SharePoint site and change the role of the newly added Owner to Member , the user disappears completely.
Also, I noticed when I try this again and again , the group disappears from Outlook.

So we checked the following:
Case 1:
add user to a group using Add-PnPMicrosoft365GroupOwner command
try to change the role
user is removed

Case 2:
add user from outlook or directly from azure
try to change the role
user stays with the role change

Any help here will be much appreciated.

Thanks and Regards,
Karishma Sahuji