Why do many pods fail to communicate with the master
Try to remove the easyrsa relation with kubernetes-master in juju.

juju remove-relation easyrsa kubernetes-master


Recreate it afterwards:

juju add-relation easyrsa kubernetes-master


The certificate seems to be recreated for the master, which should now include it's clusterip (10.152.183.1) address as well in the SAN record of the certificate.