Hi Maurizio,
Thanks for your patience.
We are glad to announce that our v19.2.0.51 patch release is rolled out with the fix for the reported issue- "Templated tooltip in TreeMap getting cropped". You can use the latest Syncfusion.Blazor NuGet package version to get rid of the reported issue.
NuGet Package:
https://www.nuget.org/packages/Syncfusion.Blazor We thank you for your support and appreciate your patience in waiting for this release. Please get in touch with us if you would require any further assistance.
Regards,
Durai Murugan V