It’s the same as what the brothers on the previous floor said,.
After today's update, there was a situation where the game got stuck during combat, and the sound effects were normal when stuck.
Although the apk is not forced to be updated, I saw a new version 7.1.1(7120) in the 4399 client.
I uploaded it to apkadmin, this may be useful to you, here is the link:
com.bilibili.blhx.m4399_7.1.1_7120_origin.apk - 1.3 GB
Thank you very much.