The argument to resize can cause user-code to execute. That code could call transfer, detaching the buffer. The algorithm steps don't check for [[IsDetachedBuffer]] after coercing the argument in Step 5:

4. If IsDetachedBuffer(O) is true, throw a TypeError exception.
5. Let newByteLength be ? ToIntegerOrInfinity(newLength).
6. If newByteLength < 0 or newByteLength > O.[[ArrayBufferMaxByteLength]], throw a RangeError exception.
7. Let hostHandled be ? HostResizeArrayBuffer(O, newByteLength).

This turned up as a crash in testing the implementation in XS. One solution is to repeat Step 4 after Step 6. Whatever the solution, it should probably be normatively defined so engines behave consistently.