A fairly sizable increase in V8 heap memory occurred due to the V8 roll at https://chromium.googlesource.com/chromium/src/+/cebfc209d737ca36c02775eb86f306cbe556ae69. However, this looks like an expected increase, as https://chromium.googlesource.com/v8/v8/+/b2f0d8617b9bb8aa463f6d8b7f8ca99b6ab285de is in the roll, which essentially removes an earlier change that resulted in a similarly large decrease.