Oh? What bugs are those, please?
Yeah, don't download the latest version up there. It's a proverbial deathtrap of whimsy and horror.

In an effort to correct the Dmap offset issues, I slid the position of one of the Dmaps to the other side of its 16x8 grid, hoping to eliminate those "can't move to the right" bugs, but of course it offset all the warps in that range too. (I knew it would, but I did it anyway. -.- Couldn't resist.)
It's because ZQuest crashes so much in this version and takes up A F*CKTON of RAM, constantly doing things... It's not healthy to have this version of ZQuest open.
I should really make a trial run of DoY in ZC 2.5 We'll see how well it runs then. Because if it runs perfectly, without any bugs,
WE'RE UPGRADING.
No, no, don't fear this... There's nothing to fear at all. It's perfectly harmless. Definitely much less harmless than this build 183. Far fewer bugs. More stable ZC Player.
Easier movement on conveyor belts. Ya hear me?

Plus I can adjust the difficulty on just about anything.
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When the Vines dungeon is dried up after beating the boss, the flowers that spit fire will be slashable instead. Then you can pass.
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Anyway, here's a new version, which, hopefully, (And oh lordie I do mean hopefully...) has all the bugs fixed. Artistic, the bugs you posted (Thanks again for those, by the way.) regarding the various errors in the Cave of Mirrors were due to Dmap oddities. In Overworld type maps, doorways respond oddly. I might still have some overhead bugs to fix, but I did fix at least most of the Dmap-related errors that I could see, and corrected a whole mess of warps.
Oh, also, that HCP on the roof of Vines, to the left of the Medallion, is accessible from a room in the Northwest of the Vines place.
If possible, try to recollect both Medallions. Both have renewing invisible fire enemies on the bushes in front of the chest, so the triggers ought to be retriggerable. Definitely try it again.
New version uploading in a bit. I just couldn't wait.
DoY Cave of Mirrors & Medallion Bugfix