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eptrainingeptraining 

Lightning datatable with first column type 'action' - dropdown cut

Last time I checked this lightning page, a couple of months ago, the dropdown menu for an action column (first column on datatable) was displayed as expected (not cut,  top-right aligned to the corner of the dropdown button). Yesterday I've discovered ... not anymore. The dropdown was displayed correctly for months and months, I do not know exactly when this "orientation change" happened. Did anyone else encounter the issue?
User-added image 
The column is described very simple:
{ label: 'Action', type:'action', typeAttributes:{rowActions: [
                {label:'Show Activities' , name:'activities'},
                {label:'Show Last Update' , name:'mgntupdate'},
                {label:'Show Forecast', name:'forecast'}
            ]}},
The datatable is contained inside a tab, dropdown still behaves ok for last row (no cuts). 
I know one solution is to "transform" first column  in last column, but it's not just one table. Besides I am interested in how can I maintain the code if what I migrated last summer is losing functionality in less than a year... 
Your thoughts are appreciatted in advance.