Yes, this has happened with their mint choc ices on a stick and several other products we regularly buy. For a while, there was no wholemeal bread on the bakery counter. This loaf, sliced and unsliced, was relaunched a few weeks later as "Hi Fibre" bread. No difference in ingredients that we could see.
However, I asked Tesco on Twitter via DM whether they could confirm if the current difficulties customers are experiencing with availability of cornflour is a temporary supply chain issue or if the product is not currently being stocked, for example, because the packaging is in the process of being redesigned or because the product weight is changing.
Their reply was that it is "has been discontinued due to lack of customer demand".
For years, they stocked tinned semolina and tinned sago pudding. Can't imagine they sold too many of those. Seems crazy to me to discontinue a staple product like cornflour.
We do a big C&C each week for a full week's shopping and their range of fresh turkey has diminished considerably. No diced turkey and no 7% fat turkey mince is now available in what it a very large Tesco store. This may be due to current bird flu problem but fed up seeing the range of products they sell online reducing.