Info wanted about lnd version 0.15.4-beta-build-2

An update to lnd version 0.15.4-beta-build-2 is available in the Umbrel app store. The description is " Enable RPC middleware in LND". I know that 0.15.4 came out as a bug fix - but could someone please explain what this new build 2 update is all about?

Been looking at the Github announcements, but they only go as far as 0.15.3

Good question… The official lnd 0.15.4 beta branch was last touched 11 days ago…