Seems the binaries were upgraded just before (actually looks like after?!) the freeze and now I guess we have to wait until Buster is out the door before the plugins get updated to match?
We have the same problem now - geany has been upgraded to 1.34.1-1 and
all of the plugins are stuck on 1.33+dfsg-1 which means on dist-upgrade
all of the plugins are removed unless you pin them.