Mobs sometimes bounce after long fall

My Windows Bedrock client just updated to 1.17.40 so I updated my Linux Bedrock server to the same. I am the only player on the server since the update. I have a mob grinder that drops the mobs 20-28 blocks onto lower slabs (above hoppers). Usually the mobs either die or stand there after falling to the bottom of the grinder. Since today's update, maybe around 5-10% of the mobs when they fall start bouncing off the bottom – as if they hit a slime block instead of stone slab – they seem to bounce 10-15 times before coming down. They do not hit the lower slab on the bottom of their bounce – the bottom seems to be where the top of the block would be if it were a full block. It's a pretty minor bug, but it seems odd, and worth mentioning in case it's indicative of a bigger issue.