An update - as usual, I fed my dogs upon loading my world so they would quit their incessant whining. I went cave exploring out a bit far away, then came back to my house. My dogs' health was like it was when I loaded the world - depleted. I am thinking this is an issue that happens every time the dogs have to be re-loaded rather than the entire world.
A second update - dogs are no longer teleporting into my house upon loading, but still are losing their health when they themselves are re-loaded. I just did some tunnel mining and when I got close to my house (unsure how many meters, I'll check next time) the dogs were teleported to me, with their health depleted.
I am having the same problem. During 24a I had two resource packs that worked fine, and a third one that didn't (probably because it is 256x256). Now no resource packs are selectable except for the default. When I click on a resource pack the game freezes temporarily, my cursor shows "loading", but at the end of it all it's still the default resource pack.
I am actually having the teleportation issue still, but I'll report that elsewhere.