I've recently discovered that some DTF-formatted games won't run except from the original images.

I extracted both DTF file and ATTUS boot loader, created a new disc image but the game did not work from it. Also the result processed by AntiDTF does not work. Also tried other boot loaders of DTF-files without results.

System configuration in the emulator is unchanged. What can be the problem?

Of the games found, at least the following games have this issue:

O.K.Yah! (OK-YAH.DTF from 07.img)
Super Pipeline ZX (PIPELIN2.DTF from 15.img)
Dominator (DOMINATO.DTF from 13.img)
SDI. Now the Odds are Even (SDI.DTF from 02.img)

https://enterpriseforever.com/downloads?dir=Attus_programjai/&?dir=Attus_programjai%2F&download=Attus_lemezei.rar

not working:

Sorry, it is not the Loader which puts code into 0008h-000fh, Basic ROM fills it up.
Please try to load without Basic cartridge it will work.
Probably the problem is the same with other programs.

OK-YAH works also without Basic cartridge, the loader jumps to 0018h instead of 0028h where the jump instruction is stored, and Basic fills that area also.
SDI has similar problem, it works without Basic cartridge, the loader jumps to 0020h instead of 0028h

Then will be good idea add zero fill RST area to the Anti DTF loader?

I have created a DTF Fixpack, Dominator had problems after the 0000-002fh issue was solved, because the level files were packed also. DTFfixpack.zip is the source code for updating the loader, and if needed to unpack level files, and patch the length into the file.

DTF_FixedPRG.zip contains the 4 programs which are fixed.