I have also experienced this bug playing in Realms. After the 1.18.1 release I came back to my base and found that all entities had disappeared from certain chunks. I had about 7-8 nametagged ravagers as well as a couple of llamas and horses confined in a one-chunk pen where they could not cross chunk borders. They were all gone from the chunk, just like experienced in MCPE-144208. I am playing on an iPad Pro. Let me know if there are any more details I can provide that would be helpful!
I am experiencing this bug in the Minecraft bedrock mobile edition released today 10.25.2022, 1.19.40. I’m on a iPad 19th gen running iOS 15.6.1. I have some video clips of the bug but couldn’t upload due to file size. Let me know where I can send those if those would be helpful!🙂