Delete data with partial update not working

Hi,
I would like to report a bug on partial update. If I add new records (with new ids) using UpdataData with 'partial' option and after that I delete the same records using again Updata Data with 'partial' option (and marking them as 'deleted') everything works fine. But if i do the same, when the report contains a calculated measure, the 'delete' operation breaks.
I prepared a JSFiddle to reproduce the issue:

• click on 'Add New Data' (works fine: new data is added under 'green-USA')
• click on 'Remove Data' (works fine: data under 'green-USA' are removed)
• then click on 'Add Formula' (works fine: a new measure is added in the report)
• click again on 'Add New Data' (works fine: new data is added under 'green-USA' and the formula is correctly computed)
• click again on 'Remove Data' -> data are not removed.

I'm aware that this is a very particular combo of actions, but some users reported it to us.
Could you please fix it?
Thank you!