Hopefully reporting three in one topic is fine. These are each about backwards compatibility with old v2.10 quests. These were found in Link's Decision 2. They work as intended in ZC v2.53, but not in ZC v2.55. I'm using alpha 112 build 13th Feb 2023 in the videos. The first two are also in earlier v2.10 quests, but the third has to be pretty rarely used so I don't know.
First is the no secret sounds. The ZC v2.10 screen flag for No Secret Sounds doesn't stop the secret sound from playing in v2.55. The first instance is almost immediately when you start the quest. At the very introduction when you pick up your sword, it triggers a combo change that adds direct warps beneath you, so you pick up your sword and then suddenly your map appears and the music starts. Now you hear the secret sound before you warp to the screen with the map and the music. There are lots of other examples, but the easiest is the big statues in the Mountain, where a switch lowers them. It's mostly just annoying, and sometimes you hear multiple in rapid succession.
Second is the secret money caves. You should go in, read some text, collect the money, and then it's basically an empty room after that. But for some reason, collecting the money isn't permanent. It doesn't happen when you have a cave/stairs that leads to the zelda1 screen 80. But when the cave leads to an actual screen, you can do it over and over. to see if I could figure out the cause, I tried changing the warp type from insta-warp to entrance, changing the room dmap from cave to dungeon to bs overworld, changing the level from 1 to 19 and even 0 just for fun.
Third is an uncommon maze path issue, not so much a bug as a change. There is a post-game dungeon that is a series of lost woods maze screens. When playing my quest in v2.53, if my maze path solution is west-east-north-east and east is a side warp, it doesn't go through the side warp until the maze path is solved. In v2.55, it goes through the side warp as soon as you go east, ignoring the maze path. Fortunately, the puzzle solution still works. But it does make a wrong step much more confusing. That's not a great description of the puzzle, but point being the precedence between solving the maze path and triggering the side warp is reversed.
Videos often help, so I have a one minute video of each. https://ufile.io/f/neq31
The link expires after a few weeks. Let me know if there is anything else I can do to help. Thanks.