Has Binance made a significant change in their Market Order matching logic? (Quantity matched is different).

Until last week, if I placed a Market Order (in Spot or Margin) say Buy for qty 100 of crypto, it would Buy qty 100. This week it now places a slightly different quantity like 99.46.

The change of quantity happens after you click the 'Buy' or 'Margin Buy' button, just before it is taken to market. The matched quantity in the trading history is 99.46 and not 100.

I only ever use the 'Amount' option on the website, never the 'Total'.

I thought it could be something on my end, but now I think I figured out what's happening - at the time of placing the order Binance calculates the available quantities in the order book and adjusts the quantity for slippage.

If this is correct, this is a TERRIBLE change. My trading has gone upside down because I always look at the quantity of crypto and now I have no control on how much quantity actually goes into the market. Anyone placing a market order already knows about slippage and could place a limit order if he wanted. What is Binance thinking?

How come no one has posted this in last few days or discussed here? And am I missing something?