Hi Otto,
We regret for the inconvenience caused.
We were able to reproduce the issue on editing the TreeGrid cell. We have already logged issue report and have also fixed this issue on “cannot use space bar when editing an item in Treegrid”. Also we have created a support incident under your account to provide the fix for this issue.
Please log on to our support website to check for further updates.
https://www.syncfusion.com/account/login?ReturnUrl=%2fsupport%2fdirecttrac%2fincidents
Please let us know if you require further assistance on this.
Regards,
Mahalakshmi K.