Linksys wrt1900acs rollback to 19.07

Hi there, (sorry for my bad english)
I was using openwrt 19.07.3 on a Linksys WRT 1900ACS and my laziness was in my way =P
In last few days I used Image Builder to create a 21.02.1 image for it
Had problems with new network config, but I managed to flash and access it.
As I use keepalived, to manage a failover between this one and a Linksys WRT 1200ac, everything was alright, until the moment I asked 1900 to be master...
One of my wans is pppoe and... results below:

The image is from speedtest app for Windows 10

From top to bottom:
router with openwrt 19.07.8
router with openwrt 19.07.3
router with openwrt 21.02.1

Just reporting =)