Since the update 1.20.30 – this issue along with other "lag" issues have been reported.
Seems the only one I have found is this one. MCPE-175424. I have noticed loads of complaints elsewhere on the internet, but haven't located more MCPE.
I can confirm this! Since the new update came out, I have had many issues with lag when I hadn't before. Sounds lag behind as well as when breaking blocks and placing them. Movement is the same.
Correction - upon filtering issues more thoroughly – there are far too many duplicates in regards to bugs on the new update.