I have just reproduced this. I confirm that it is a problem on our side.
After analyzing the code, I see that the feature should work. The corresponding WinAPI flags like ES_NUMBER or ES_UPPERCASE are set for the textbox cell editor, but it seems they do not have any effect.
We need some time to figure out why the code that has worked for years stopped working. Give us a day or two to investigate the issue, and we'll definitely get you back as soon as we have any result.