Master slides have different designs, different fonts, different color schemes, etc. so - it makes sense that a table inserted on different master slides would be different. But - the choice of the default style pseudo-style is document-global. I suggest it be linked to the master slide.
The topic was on the agenda at the design meeting. The request is explicitly "to keep for each master, a choice among the available table pseudo-styles [ed: a choice that picks one of the TS as the default when inserting a table]; the request is orthogonal to whether or not the pseudo-styles are stored with the documents or not". This is might be one solution but surely is not the right way to promote TS as full-fledged styles.