Differences in performance of the lhu command on Rocket and spike

[90ICEDA]

Type of issue: bug report
Impact: unknown
Development Phase: proposal
Other information：

Hi, I noticed a difference between Rocket and spike implementations, when executing the lhu x8,-7(x21) instruction, spike will execute normally while Rocket will report an error about not being aligned, is this a stricter measure taken by Rocket in handling alignment errors?
I hope to get your reply, please correct me if my thinking is wrong, thanks!